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Eze Software QA Analyst Interview Question

I interviewed in Boston, MA and was asked:
"In a pitch black room you have a drawer with 27 black socks, 18 gray socks, and 9 navy socks. The socks are all individual. What is the minimum number of socks you have to pull out of the drawer to guarantee you have a pair of socks that is not navy?"
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Part of a QA Analyst Interview Review - one of 151 Eze Software Interview Reviews

Answers & Comments

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12 - assume worst case and you pick out the 9 navy socks first. You then have to pick 3 more socks to guarantee you have a pair of either black of gray. Think out loud when answering. They want to know how you go about solving problems.
- Interview Candidate on Aug 17, 2010

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