Weighing 9 Balls Puzzle (Find Lighter One) || Weighing 9 Balls Puzzle (Find Heavier Ball) In minimum Weighs - Interview Puzzle

 Puzzle #1

There are 9 balls out of which one ball is Lighter in weight and the rest are of the same weight. In how many occurrences will you find the Lighter ball?

solution

Divide the 9 balls into three sets, each containing 3 balls each. Let’s name them for easy understanding. A {3 balls}, B {3 balls}, C {3 balls}. Now weigh them against each other to find out the set containing the Lighter weight ball.

Puzzle #2

There are 9 balls out of which one ball is heavy in weight and rest are of the same weight. In how many occurrences will you find the heavy ball?

Solution

Divide the 9 balls into three sets, each containing 3 balls each. Let’s name them for easy understanding. A {3 balls}, B {3 balls}, C {3 balls}. Now weigh them against each other to find out if the set contains heavier weight balls.