Nielsen Interview Question: Not difficult, but unexpected... | Glassdoor

Interview Question

Senior Analyst Interview

Not difficult, but unexpected, I just asked for a second to

  think about it and then gave my answer: You have 9 pool balls and a balance with two opportunities to use the balance. All of the balls weigh the same except one, how do you figure out which one?

Interview Answer

2 Answers


Separate balls in groups of 3, balance two groups, if one weighs more, you know the odd ball is in that group, if they are the same, the odd ball in the 3rd group. Repeat with the 3 individual balls.

Interview Candidate on Nov 27, 2012

How do you know odd ball is heavier or lighter than the others? It is just mentions that odd ball weighs different but not specifically heavier or lighter.

Anonymous on Nov 6, 2015

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