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A drawer has 21 blue, 15 black and 17 red socks. How many socks must be take out to be 100% sure for one good pair?

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A man has 53 socks in his drawer. They are 21 identical blue, 15 identical black and 17 identical red. The light went off and he is in complete darkness. How many socks must he take out to be 100% certain that he has a pair of black socks?

posted Jun 14, 2017 by anonymous

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