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Dimple

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Punjab

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Maths Quotes

Pure mathematics is the world's best game. It is more absorbing than chess, more of a gamble than poker, and lasts longer than Monopoly. It's free. It can be played anywhere - Archimedes did it in a bathtub.

Richard J. Trudeau, Dots and Lines

Students attend our lectures, not because the mathematics we teach ‘makes lots of fun’ for us, but because they believe they can learn some essential knowledge from us. And each of our young students has only one life to live. We should therefore be a

H. Behnke

Placed User Comments

M4Math helped me a lot.

Vipul Chavan 4 years ago

Thanks m4 maths for helping to get placed in several companies.
I must recommend this website for placement preparations.

yash mittal 5 years ago

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to (10 years ago) "Other"

pls send the website of online arithmetic problems for daily practice

and send online General Knowledge website for practice

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to (10 years ago) "Other"

how it differ by 80?

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(10 years ago) "Other"

N is a natural no which is greater than 99 and d number contains exaclty 2 factor ie k,k-2, than find how many possible value of N.
1. 2
2. 4
3. >4
4. such no does not exist
asked in elitmus on june 20...

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(10 years ago) "Other"

What will be the output of the following code statements?
integer x = 34. 54, y = 20, z =-5
print ( y > 50 AND z > 10 or x > 30 )
a. 0
b. 1
c. -1
d. 10

Reply Like? Yes | No

(10 years ago)

fistly type right.. but b.1 is right answer
y>50&&z>10==x>30
first part return false nd secnd part return true nd bcz of or operation ans is 1

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to (10 years ago) "Other"

hi rakesh, would u pls tell me have u got job through elitmus ??? coz i saw u have been solving prblms from 8 month..

Reply Like? Yes | No

(10 years ago)

yes,ofcourse..elitmus will be useful.coz ur branch is electrial and electronics..

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(10 years ago)

could u plz tell me shilpy...can i get job through elitmus being a electrical engineering student?

Like? Yes (1) | No

(10 years ago)

yes...pritam umay got job through elitmus.

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(10 years ago) "Other"

13,33,63,next series number what

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(10 years ago)

is this the whole series?

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(10 years ago)

as per the given sequence
13+20=33
33+30=63
63+40=103

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to (10 years ago) "Other"

Congratulation Saraswathy

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(10 years ago) "Other"

"Don’t argue with idiots because they will drag you down to their level and then beat you with experience."

Reply Like? Yes (13) | No (2)

to (10 years ago) "Other"

hii send me some AMCAT questions on vineysagar2@gmail.com

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to (10 years ago) "Other"

Find the maximum slope of the curve
f(x) = 2x + 3x^2 - x^3 - 27
Can u suggest me y are we taking f''(x) = 0 and when should we take three step f'''(x) plz clarify the concept i'm confused ...

Reply Like? Yes (1) | No

(10 years ago)

Hi Akanksha,

f'(x) = -3x^2 + 6x + 2
now for slope of f(x) to be maximum, the value of f'(x) must me maximum.
so, f'(x) is a quadratic equation with curve bent downwards. So, the local maxima will be the global also.
now, calc f''(x) = 0.
you get the point of global maxima and hence the ans.....

slope of f(x) is maximum at x = 5.

plz tell me if not understood.
ID: anurag160991@gmail.com

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(10 years ago)

f(x) = 2x + 3x^2 - x^3 - 27

to find slope of a function f(x) find f'(x)
slope = f'(x) = 2 + 6x - 3x^2 = g(x) let

now we have to find maxm of g(x)
g'(x)= 0 gives the point of maxm/minm
if g''(x) > 0 then g(x) has mimm
if g''(x) < 0 then g(x) has maxm

f''(x) = (6 - 6x) = 0 => x = 1

f'''(x) = -6 < 0 => f'(x) has a maxm at x = 1

maxm slope = f'(1)= 2 + 6 - 3 = 5

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(10 years ago)

Thankyou @Rakesh and @Anurag

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to (10 years ago) "Other"

thanku sir.........

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(10 years ago) "Other"

8 12 24 60 180 ?

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(10 years ago)

Answer= 630
Reasons:
8*1.5=12
12*2.0=24
24*2.5=60
60*3.0=180
180*3.5=630

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(10 years ago) "Other"

can anyone send me microsoft placement papers ? plzz it will be helpful

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(10 years ago) "Other"

Every day a cyclist meets a train at a particular crossing. The road is straight and both are travelling in the same direction. The cyclist travels with a speed of 10 Kmph. One day the cyclist comes late by 25 min and meets the train 5 km before the crossing. What is the speed of the train?

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(10 years ago) "Other"

does any one has placement papers of capital iq.please send it to my id:nikitha311991@gmail.com

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(10 years ago) "Other"

any one got the interview dates from IBM?????

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to (10 years ago) "Other"

unable to solve crypto question,,pls help

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(10 years ago)

www.informguru.com/2013/01/solving-elitmus-cryptarithmetic.html
www.criptarithmetic.blogpost.com

Like? Yes (3) | No

(10 years ago)

thanku RAKESH sir ......n seriously shalini dis site is best ..:)

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to (10 years ago) "Other"

If 5/x+6y=13 and 3/x+4y=7, find the value of y?

Reply Like? Yes (1) | No

(10 years ago)

5/x + 6y = 13
3/x + 4y = 7
Lets take a=1/x... Then the 2 eqns ll become
5a + 6y = 13 --->(1)
3a + 4y = 7 --->(2)
(1) - (2) =>
2a + 2y - 6 = 0 => a + y - 3 = 0
a = 3 - y
5(3 - y) + 6y = 13
15 - 5y + 6y = 13
y = -2
a = 3 - y => 3 - (-2) => a = 5
1/x = 5 => x = 1/5

Ans : X = 1/5, Y = -2

Like? Yes (6) | No

(10 years ago) "Other"

can any one tell me how to learn java very easily and which site we have to prefer for programings?

Reply Like? Yes | No

(10 years ago)

u may try w3schools.com

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(10 years ago)

in dat it is nt their at all about java in dat we can prepare .net

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(10 years ago)

www.javatpoint.com best website for java

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(10 years ago)

www.tutorialspoint.com

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to (10 years ago) "Other"

send me your mail-id saraswathy, i have to learn more from u, need to ask some doubts :)

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to (10 years ago) "Other"

Saraswathy... ne super ma.....

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to (10 years ago) "Other"

A man has to pay 975rs in yearly instalments and each instalment is less than the earlier one by 5rs. The amount of first instalment is 100rs. In what time the entire amount will be paid?

a)15 b)12 I need complete solution pls help me

Reply Like? Yes (1) | No

(10 years ago)

First installment = 100
sec ll be 95, third ll be 90 nd so on...
So 100+95+90+85+.... = 975
a = 100, d=-5, Sn=975,
Sn=n[2a+(n-1)*d)/2
975 = n[2(100)+(n-1)*(-5)]/2
n^2 - 41n + 390 = 0
Solving the above eqn ll give n=15 (or) n=26...
Given options are 15 nd 12... So n value is 15...

Ans : (a) 15

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(10 years ago) "Other"

plzz suggest me any book for the verbl part of elitmus.........

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(10 years ago) "Other"

i need elitmus sample paper please send me on my id srysh_sinha@yahoo.com.ASAP...

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to (10 years ago) "Other"

Congratulation Giri Babu

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to (10 years ago) "Other"

The radius of a circle is 13cm and AB is a chord which is at a distance of 12cm from the centre. The length of the chord is?

a) 10cm b) 8cm

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(10 years ago)

AB is a chord...
Let O be the center of circle nd M be the mid-point of the chord AB...
Then OM = 12cm, OB = 13cm, AM=MB , AB=AM+MB
Apply Pythagoras theorem
(OB)^2 = (OM)^2+(MB)^2
(MB) ^2 = (OB)^2-(OA)^2
(MB)^2 = (13)^2 - (12)^2 => 169-144 = 25
MB = 5
AB = 5+5=10

Ans : (a) 10cm

Like? Yes (2) | No

to (10 years ago) "Other"

A black monkey is climbing a 200m tall building. It starts from the ground, climbs 4m in the 1st second, slips 2m in the 2nd second, climbs 6m in the 3rd second, then slips 2m in the fourth , climbs 8m in the 5th second, slips 2m in the next & so on when would reach the top of the building ?

Reply Like? Yes (1) | No

(10 years ago)

in 27th second
From above explanation we can develop a series like, 4-2+6-2+8-2+10-2+...............=200
Grouping the terms (4-2)+(6-2)+(8-2)+(10-2)+.........=200
2+4+6+8+10+........=200,
Arithmetic series Sum =(n/2)[2a+(n-1)d], Herea=2,d=2,
So (n/2)[2*2+(n-1)2]=200, n^2+n-200=0, n=13.65
As the above group of terms is repeated in alternate 1 second, so at 13.65*2 ~ 27th sec. total 200 m. will be covered

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to (10 years ago) "Other"

really great genius...

Reply Like? Yes (1) | No

(10 years ago) "Other"

Q3. Raman is not wearing purple and Aman is not wearing black. Raman and Sahil wear different colors. Avinash alone wears green. What is Sahil's color, if all four of them are wearing different colors?
o Green
o Black
o Purple
o Can't Say

Reply Like? Yes (139) | No (8)

(10 years ago)

Answer would be Can't Say

Like? Yes (50) | No (5)

(10 years ago)

answer is purple

Like? Yes (11) | No (23)

(10 years ago)

Answer is purple

Like? Yes (1) | No (9)

(9 years ago)

Ans would b purple

Like? Yes | No (6)

(9 years ago)

purple is the ans

Like? Yes | No (9)

(9 years ago)

ans is purple becoz Raman is not wearing purple mean that it was wear by sahil

Like? Yes (2) | No (5)

(7 years ago)

How can you say answer is purple??
The answer should be can't say, because all four of them are wearing different colors.

Like? Yes (14) | No

(2 years ago)

Answer is Can't Say.
Reason:
1.Raman wear black.
2.Aman wear Purple.
Clue:Raman and Sahil wear different
Sahi:they can't say about him.

Can't say

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(10 years ago) "Other"

If HARD is coded as 1357 and SOFT is coded as 2468, what will 21448 stand for?
o SHAFT
o SHORT
o SHOOT
o SHART

Reply Like? Yes | No

(10 years ago)

SHOOT is the ans
2-S
1-H
4-O
4-O
8-T

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(10 years ago) "Other"

There are few benches and some number of students in class. if three students are seated in each bench,all the benches are filled but one student is left. if four students are seated in each bench then all the students are seated but one bench is left. how many benches are there and how many students are there?

Reply Like? Yes | No

(10 years ago)

5 benches & 16 students
If number of benches= b
When 3 students are seated in each bench & 1 is left, number of students=3b+1
When 4 students are seated in each bench & 1 bench is left, number of students=4(b-1)
As number of students are same in both the cases: 3b+1=4(b-1) ,b=5
So number of students=3b+1 or 4(b-1) =16

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(10 years ago) "Other"

If selling price becomes double then profit becomes tripple find profit percent??

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(10 years ago)

100%
Let C.P. be Rs. x and S.P. be Rs. y.

Then, 3(y - x) = (2y - x) y = 2x.

Profit = Rs. (y - x) = Rs. (2x - x) = Rs. x.

Profit % = x x 100 % = 100%
x

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(10 years ago)

100%
let sp-cp=p
then 2sp-cp=3p
from above 2 eqns
sp/cp=2
sp/cp-1=1

(sp-cp)/cp *100=100%

0/cp*100=100%

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(10 years ago) "Other"

for amcat which book shoul i prepare for aptitude and reasoning

Reply Like? Yes | No

(10 years ago)

R S aggarwal for aptitude

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(10 years ago) "Other"

Can U provide about banking careers the posts that are present in banking from lower to higher?

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(10 years ago) "Other"

a group consisting of 25 teachers, 20 engineers, 18 doctors and 12 salesmen visited a fair and spent Rs 1330 altogether.It was found that 5 teachers spent as much as 4 engineers, 12 engineers spent as much as 9 doctors and 6 doctors spent as much as 8 salesmen.if every person in a professional gruop spent the same amount, find the amount spent by each engineer
plz solve this

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(10 years ago)

i think that the answer is 17.051

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(10 years ago)

how this answer come can u plz explain ?

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(10 years ago)

Let the money spend by teachers be 't', engineers be 'e', doctors be 'd' and salesmen be 's'
25t + 20e + 18d + 12s = 1330 -----(1)
5 teachers spent as much as 4 engineers
5t = 4e
t = 4/5 *e ----(a)
12 engineers spent as much as 9 doctors
12e = 9d
d= 4/3*e ----(b)
6 doctors spent as much as 8 salesmen
6d = 8s
s = 3/4*d = 3/4*4/3*e = e ----(c)
Substituting these values in eqn (1)
25*4/5*e + 20e + 18*4/3*e + 12e = 1330
20e + 20e +24e + 12e = 1330
76e = 1330
e = Rs.17.5

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(10 years ago)

thanks for your explanation

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(10 years ago) "Other"

each time head occurs i give you 3 rupees if tail occurs i give you 2 rupees there is a chance of 20 times finally no amt in their hand how many heads and tail occurs?????? i dnt knw the ful question....pls give right answer.....

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(10 years ago)

i think that the correct question should be if head occurs i will give u 3 rs. but if tail occurs you will give me 2 rs. according to that the answer will be head=8 times and tails=12 times

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(10 years ago) "Other"

9 3/4+7 2/17- 9 1/15=?

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(10 years ago)

the answer can be 7.036

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(10 years ago) "Other"

In a dark room with no equipments other than a clock,you are given a pendulum.how can you measure your height now?

Reply Like? Yes (4) | No

(10 years ago)

Use formula s = ut+1/2 at^2
s= Height from which pendulum ball is freely dropped
u=Initial velocity, it would be 0 when dropped freely
t=time taken to reach ground
a=gravitation pull = 9.81 m/s2

So you need to start counting time using clock as soon as you drop the pendulum ball from your head in standing position & stop it the time when i reaches ground (when you hear the sound it hitting ground ). This will give you t.
Putting in formula Height = 1/2*g*t^2
You should get the answer

Like? Yes (4) | No

(10 years ago)

Time period of pendulum is given by 2*3.14*(sqrt(height of rope/gravity)).
gravity=g=9.81
using clock you can find the time period of pendulum.(average time for 1 oscillation).using the formula from time period you can measure the heigth of the rope. Then using the rope you can measure your own height.

Like? Yes (2) | No

(10 years ago) "Other"

3^3-3^(3-1)=18
therefore x=3
so x^x=3^3
=3*3*3=27

Reply Like? Yes (2) | No

(10 years ago) "Other"

anyone have attended optimus information interview for software developer trainee.....plz reply what kind of questions are asked in that and what comes in technical round???

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(10 years ago) "Other"

Cleared Athena Written round, thanks to this site :D

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(10 years ago) "Other"

@Sravya
ur sans from second method is right
but i m not able to understand this term
N=(1+1)+(1+2)+(1+3)+(1+4)+...
rest all is ok
can u plz explain me???
thnks for ur reply

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(10 years ago)

hi naina..
ya bcz..each tym the 2 is increasing i just mentioned how many two's are present...

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to (10 years ago) "Other"

your ans is right. can you please explain how it comes PQDZFH...

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(10 years ago)

divide the word into 2 parts then u can get the ans

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to (10 years ago) "Other"

Goods were bought for 600rs and sold the same day for 688.50rs at a credit of 9months and thus gaining 2%. The rate of interest per annum is?

a) 50/3% b)49/3%

I need complete solution plz help me

Reply Like? Yes (2) | No

(10 years ago)

It means after 9 months he will get 688.5 rs from buyer

1.02x=688.5

x=675

675 is the price after 9 months

interest=675-600=75 rs

600*r*(9/12)*1/100=75

r= 16 2/3 % => r=50/3%

Ans : (a) 50/3%

Like? Yes (1) | No

(10 years ago) "Other"

Goods were bought for 600rs and sold the same day for 688.50rs at a credit of 9months and thus gaining 2%. The rate of interest per annum is?

a) 50/3% b)49/3%

I need complete solution plz help me

Reply Like? Yes | No

(10 years ago) "Other"

For accenture placement exam? is m4maths is enough??? i have it next week ... if possible share your experience of the test..plzzz

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(10 years ago)

hey hie ...where you have accenture drive ???

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(10 years ago) "Other"

can anyone mail me tech mahindra question papers...???my mail id is vchinni94@gmail.com

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(10 years ago) "Other"

Form 8 digit numbers from by using 1, 2,3,4,5 with repetition is allowed and
must be divisible by4?

Reply Like? Yes | No (1)

(10 years ago)

8 digit number divisible by 4 is 51234324

Like? Yes | No

(10 years ago) "Other"

a solution of 40lts contains 10% of sugar 10 lts.of tha solution is evaporated find the % of sugar in final solution?
a)13 1/3% b)13% c)15% d)20%

Reply Like? Yes | No

(10 years ago)

a) 13 1/3%
Quantity of sugar in 40 lts.=40*(10/100)=4 lts., So quantity of water=40-4=36
On evaporation of 10 lts. water remains=36-10=26
% of sugar in final solution=100*4/(26+4)= 40/3= 13 1/3

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(10 years ago) "Other"

@sravya thanks for answer
but m not able to understnd why u r taking number f terms 120 while applying A.P.bcz
3(1,2) is made up of two terms
5(1,2,2) is made up of three terms
7(1,2,2,2) is made up of four terms
thus 3,5,7 consists of 9 terms thus resulting sequence which forms an A.P. will not have 1230 terms but will have some less number of terms

Reply Like? Yes | No

(10 years ago)

ok..i too thought the same..some less terms will come..
ok now what is the ans..is 2461 crct..?

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(10 years ago)

@naina..ya i said one is wrong..no of terms will be reduced....so,this mthd i have solved.....
1 2 1 2 2 1 2 2 2 1 2 2 2 2 1 2 ......
=(1+2),(1+2+2),(1+2+2+2),(1+2+2+2+2)......
if N be no. of terms then
N=(1+1)+(1+2)+(1+3)+(1+4)+...
N= n+ n(n+1)/2 = (n^2+3n)/2
now (n^2+3n)/2 = 1230 => n^2+3n=2460
if n=48, (n^2+3n)=2448 & N=2448/2=1224
so series will be
sum of (1224 term + 6 term)
[(1+2)+(1+2+2)+(1+2+2+2)+(1+2+2+2+2)+...+(1+2+2...48 times 2)]+(1+2+2+2+2+2)
so no. of 1's in series=49
no. of 2's in series=(1230-49)=1181

sum of series= 49*1+1181*2 = 49+2362=2411

ans 2411

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