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

 

sol>8 times

6561 is <=3^8.
Whenever this type of question is there you can simply use this method:The no of balls say n,so if n<=3^x the x is the min number of steps to find the odd ball.