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self Math Questions and Answer Page 314

(#M40002594) SELF QUESTION Bulb height Keep an EYE

there are 2 bulbs.. there is a critical height from which if we drop the bulb then it will break. below this height the bulb will not break.. determine minimum no. of times you will drop the bulb to succesfully find out the critical height such that critical height is less then 38 and greater then 0..

(14 years ago)

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(#M40002593) SELF QUESTION Keep an EYE

if
ABCD
* E
_____
DCBA

find the value of A,B,C,D,E

(14 years ago)

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(#M40002588) SELF QUESTION proability of time Keep an EYE

if the probability of watching a car on a road in 30 min is .724 then what will be the probabilty of wathchin the car in 10 min on the same road??

virendra (14 years ago)

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(#M40002574) SELF QUESTION Keep an EYE

How many 9 digit numbers are possible by using the digits 1,2,3,4,5 which are divisible by 4 if therepetition is allowed?
a)5^7 b)5^6 c)5^9 d)5^8

Solution

_ _ _ _ _ _ _ _ _ (9 digit number)
Digits that can be used = 1, 2, 3, 4 and 5
For a number to divisible by 4, the last two digits have to be divisible by 4
So, the units digit cannot be 1, 3 or 5
If the units digit is 2, only 12, 32 adn 52 are acceptable as the last two digits
If the units digit is 4, only 24 and 44 are acceptable as the last two digits.
So, total 5 cases 12,24,32,44,52 are possible for the last two digits.
Now, the first 7 digits of the 9 digit number can be filled in 5^7 ways as each place can be filled by 1, 2, 3, 4 or 5.
So, desired answer = 5^7*5 = 5^8
This answer is given by Amitesh kumar and is right

Like manish sir answer on facebook.

aniruddha mandal (14 years ago)

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(#M40002449) SELF QUESTION Keep an EYE

A number when devided D leaves a remainder of 8 and when devided by 3D leaves a remainder of 21.What is the remainder left,when twice the number is devided by 3D?
a)13 b)cannot be determined c)3 d)42

(14 years ago)

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(#M40002436) SELF QUESTION Keep an EYE

s(D) denotes the sum of all natural numbers less than 100,containing the single digits natural number D as one of its digits.Find S(7)-S(3).option (1)220 (2)330 (3)440 (4)397

Abhinav Bharti (14 years ago)

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(#M40002352) SELF QUESTION chess board Keep an EYE

Two squares are chosen at random on a chessboard. What is the probability that they have a side in common?

virendra (14 years ago)

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(#M40002296) SELF QUESTION Keep an EYE

276+587=905then
190+543=.............

srikanth reddy (14 years ago)

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(#M40002265) SELF QUESTION Keep an EYE

Four letters are to be placed in four addressed envelopes. If the letters are placed at random into the envelopes, find out the following probabilities.

The probability that none of the letters are placed in the right envelopes is:

a) 1/24

b) 3/8

c) 23/24

d) 13/24

e) None of the above

Ranjit (14 years ago)

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(#M40002260) SELF QUESTION Keep an EYE

. We all know that Arya bhatta is the greatest mathematics belongs to india . When his daughter Mayabati was in her teen age he discovered a problem. At that time the age of mayabati is a prime number,let that age is a. After some years her age becomes b. then Arya Bhatta was able to solve that problem wit the help of he daughter mayabati. If a-b=5 & product of a& b is 26 then what is the sum of two squares?

Karan Jaitly (14 years ago)

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