View All num of num See all Photos Nielsen www.nielsen.com Overview Reviews Salaries Interviews Jobs Photos Benefits 1.5k Reviews 2.1k Salaries 544 Interviews 482 Jobs Follow Add Interview Follow Add Interview Interview Question Senior Analyst Interview Nielsen 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? Tags: See more , See less 8 Answer Add Tags Answer Interview Answer 1 Answer ▲ 0 ▼ 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 Interviews > Senior Analyst > Nielsen Add Answers or Comments To comment on this, Sign In or Sign Up.