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Question: you have ten pairs of socks five pairs blue and...

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You have ten pairs of socks, five pairs blue and five pairs black, but they are not paired up. Instead, they are all mixed up in a drawer. It’s early in the morning and you don’t want to turn on the lights in your dark room.

a. Using the pigeonhole principle, how many must you pull out to have a black pair and a blue pair of socks?

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