For problems like this, just find the 3rd root of the number. For ex: consider 3 balls, u can find the heavier by just weighing 2 balls, so min = 1. consider 9 balls, divide them into 3 equal groups, now u can weigh 2 groups to find the group in which the heavier ball lies, and u ll be left with 3 and u know how to find out of 3. so its 3 pow 2 = 9, then 3 pow 3 = 27...... 3 pow 8 = 6561. So the ans is 8.

iam not clear. 3 balls can be weighted two times. first one is to weigh with second and there after the result with third. so we r weighing two times for 3 balls. clarify my doubt plsssssssss

@sathvick13

while solving this Ques. we consider all the ball of equal weight , except the only ball which is the heavy .

ex A = 1 , B =2 , C =1

consider the above 3 balls A,B,C of weight 1,2,1 respectively . so 2 find the heavier ,

case 1 :: if u weigh 1st A,C

than when u find both the balls equal , so u'll predict that the 3rd ball B is heavy

case 2 : if u weigh 1st A,B

now when u find B heavy , then u'll predict that since only 1 ball is heavy among the 3 ball , so u dont need 2 weigh again the result with 3rd ball .