Technical support engineer interview questions shared by candidates
If you had 9 marbles, all the same size. One is heavier than the rest. You have a balance scale. How do you determine the heavy marble in the least number of moves.
I suggested going in half.. 4 marbles each. The heavier group then divided 2 and 2, then 1 and 1. If it balanced, the extra is the heaviest. The answer was using 3 each. That would identify the set of marbles faster by one move.
The answer is 2. Group them into 3 marbles each. 1. Weigh any 2 groups first - Find the heaviest group. If both are equal then the 3rd group is heaviest. 2. Now follow step 1 with 1 marble and you can find the heaviest.
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