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You are about to leave for vacation, but you forgot your socks! You go back to your room but lights are out, can't see. You remember that in your draw you have 10 pair black, 10 pair white and 11 pair blue all mixed up. How many socks do you need to take out to be SURE you have at least one matching pair?
11 years ago

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Steve
there are only 3 colors, so the 4th sock must match one of the first three.
11 years ago

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