There are 10 socks in the drawer: 5 black, 4 white, and 1 red. You are choosing in the dark and want to guarantee a matching pair.
In the worst case, your first three socks could be one black, one white, and the single red sock — all different colors.
The fourth sock must then be either black or white, so it will match one you already have.
Answer: 4 socks.
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