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Placement Papers with Solutions

(#M40001717) TCS QUESTION 2010 question Keep an EYE

There are two boxes, one containing 10 red balls and the other containing 10 green balls. You are allowed to move the balls between the boxes so that when you choose a box at random and a ball at random from the chosen box, the probability of getting a red ball is maximized. This maximum probability is
a)1/2 b)14/19 c)37/38 d)3/4

Asked In TCS (14 years ago)

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(#M40001712) TCS QUESTION 2010 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 the repetition 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 but he used 57 in place of 5^7 and 58 in place of 5^8, so we made a correction

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Asked In TCS (14 years ago)

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(#M40001711) TCS QUESTION 2010 question Keep an EYE

It is dark in my bedroom and I want to get two socks of the same color from my drawer, which contains 24 red and 24 blue socks. How many socks do I have to take from the drawer to get at least two socks of the same color?
a) 2 b) 3 c) 48 d) 25

Asked In TCS (14 years ago)

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(#M40001709) TCS QUESTION 2010 question Keep an EYE

In T.Nagar the building were numbered from 1 to 100.Then how many 4’s will be present in the numbers?
a) 18 b) 19 c) 20 d) 21.

Solution

4, 14, 24, 34, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 54, 64, 74, 84, 94
total 20 times 4 is there

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Asked In TCS (14 years ago)

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(#M40001706) TCS QUESTION question 2010 Keep an EYE

20 men handshake with each other without repetition. What is the total number of handshakes made?
a) 190 b) 210 c) 150 d) 250

Asked In TCS (14 years ago)

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(#M40001705) TCS QUESTION question 2010 Keep an EYE

There is 7 friends (A1, A2, A3....A7).If A1 have to have shake with all without repeat. How many handshakes possible?
a) 6 b) 21 c) 28 d) 7

Asked In TCS (14 years ago)

Solved kannan Read Solution (4)

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(#M40001683) TCS QUESTION question 2010 Keep an EYE

A person was fined for exceeding the speed limit by 10 mph. Another person was also fined for exceeding the same speed limit by twice the same. If the second person was travelling at a speed of 35 mph, find the speed limit.

Asked In TCS (14 years ago)

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(#M40001674) TCS QUESTION 2010 dec Keep an EYE

What percent of 60 is 12?

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(#M40001673) TCS QUESTION 2010 dec Keep an EYE

A shopkeeper bought a watch for Rs.400 and sold it for Rs.500.What is his profit percentage?

Asked In TCS (14 years ago)

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(#M40001667) TCS QUESTION dec 2010 Keep an EYE

Fathers age is 5 times his son’s age. 4 years back the father was 9 times older than son. Find the fathers’ present age.

Asked In TCS (14 years ago)

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