Latest L&T Aptitude Question SOLUTION: There are 6561 balls out of them 1 is heavy. Find the minimum number of times the balls have to be weighed for finding out the heavy ball.

3^8=6561
Ans is: 8

Answer: 8


Explanation:


Suppose there are 9 balls



Let us give name to each ball B1 B2 B3 B4 B5 B6 B7 B8 B9



Now we will divide all the balls into 3 groups.



Group1 - B1 B2 B3



Group2 - B4 B5 B6



Group3 - B7 B8 B9



Step1 - Now weigh any two groups. Let's assume we choose Group1 on left side of the scale and Group2 on the right side.



So now when we weigh these two groups we can get 3 outcomes.



Weighing scale tilts on left - Group1 has a heavy ball.
Weighing scale tilts on right - Group2 has a heavy ball.
Weighing scale remains balanced - Group3 has a heavy ball.
Lets assume we got the outcome as 3. i.e Group 3 has a heavy ball.



Step2 - Now weigh any two balls from Group3. Lets assume we keep B7 on left side of the scale and B8 on right side.



So now when we weigh these two balls we can get 3 outcomes.



Weighing scale tilts on left - B7 is the heavy ball.
Weighing scale tilts on right - B8 is the heavy ball.
Weighing scale remains balanced - B9 is the heavy ball.
The conclusion we get from this Problem is that each time weigh. We element 2/3 of the balls.



As we came to conclusion that Group3 has the heavy ball from Step1, we remove 6 balls from the equation i.e (2/3) of 9.



Simillarly we do the ame thing for the Step2.



Now going with this conclusion. We have 6561 balls.



Step - 1



Divided into 3 groups



Group1 - 2187Balls



Group2 - 2187Balls



Group3 - 2187Balls



Taking the similar steps as we did in the above example, we come to the conclusion that Group1 has the heavy ball.



Step - 2



Divided into 3 groups



Group1 - 729Balls



Group2 - 729Balls



Group3 - 729Balls



Taking the similar steps as we did in the above example, we come to the conclusion that Group1 has the heavy ball.



Step - 3



Divided into 3 groups



Group1 - 243Balls



Group2 - 243Balls



Group3 - 243Balls



Taking the similar steps as we did in the above example, we come to the conclusion that Group1 has the heavy ball.



Step - 4



Divided into 3 groups



Group1 - 81Balls



Group2 - 81Balls



Group3 - 81Balls



Taking the similar steps as we did in the above example, we come to the conclusion that Group1 has the heavy ball.



Step - 5



Divided into 3 groups



Group1 - 27Balls



Group2 - 27Balls



Group3 - 27Balls



Taking the similar steps as we did in the above example, we come to the conclusion that Group1 has the heavy ball.



Step - 6



Divided into 3 groups



Group1 - 9Balls



Group2 - 9Balls



Group3 - 9Balls



Taking the similar steps as we did in the above example, we come to the conclusion that Group1 has the heavy ball.



Step - 7



Divided into 3 groups



Group1 - 3Balls



Group2 - 3Balls



Group3 - 3Balls



Taking the similar steps as we did in the above example, we come to the conclusion that Group1 has the heavy ball.



Step - 8



So now when we weigh 2 balls out of 3 we can get 3 outcomes.



Weighing scale tilts on left - left side placed is the heavy ball.
Weighing scale tilts on right - right side placed is the heavy ball.
Weighing scale remains balanced - remaining ball is the heavy ball.
So the general answer to this question is, it is always multiple of 3 steps.



For 9 balls 3² = 9. therefore 2 steps



For 6561 balls 3^8 = 6561 therefore 8 steps