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If you have an infinite number of red, blue, yellow, and black socks in a drawer, how many socks must you pull out of the drawer to guarantee that you have a pair?

If you have an infinite number of red, blue, yellow, and black socks in a drawer, how many socks must you pull out of the drawer to guarantee that you have a pair?
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If you have an infinite number of red, blue, yellow, and black socks in a drawer, how many socks must you pull out of the drawer to guarantee that you have a pair?

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User BPratik
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the worst case is when you pull 4 out and have 4 different colors. the 5th sock MUST match one of these. 5 is the answer
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User Graham Seed
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