Latest TCS Aptitude Question SOLUTION: There are 6561 balls out of them 1 is heavy. Find the min. no. of times the balls have to be weighedfor finding out the heavy ball.

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(#M40000854) TCS Logical Reasoning question Keep an EYE

There are 6561 balls out of them 1 is heavy. Find the min. no. of times the balls have to be weighedfor finding out the heavy ball.

Asked In TCS Bhavani (13 years ago)

Solved veerbahadur gupta Read Solution (4)

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Read Solution (4) :

ankit agrawal  (13 years ago)

6561 if u notice is 3^8...n can be divided by 3(prime factor) only...we keep on dividing it into sets of 3 and in 1 weighing itself you can determine which set is heavy. Divide that set into further 3 lots...keep doing that..
6561
2187 2187 2187 1st weighing
729 729 729
243 243 243
81 81 81
27 27 27
9 9 9
3 3 3
1 1 1
ANswer is 8 attempts

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veerbahadur gupta  (13 years ago)

ans is 8.(because 3^8=6561)
coz divide all the balls in group of 3...
out of 3 ball min no of times to find the heavy is 1.
hence the solution....

Is this solution Helpfull? Yes (14) | No (9)  

Rahul Kumar Saini  (13 years ago)

8 times

Is this solution Helpfull? Yes (5) | No (10)  

Abhijit Yengantiwar  (9 years ago)

bt 6561 is perfect square of 81 ..so we can seperate the balls into 81 boxes each containing 81 balls. So nxt tym we will have only 81 balls to measure, then we can divide them again into 81 or may b 9..in this way no of times required will be less than 8...plz clear me if im worng:)

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