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In page Pigeonhole principle:
"Suppose a drawer contains a mixture of black socks and blue socks, each of which can be worn on either foot. You pull a number of socks from the drawer without looking. What is the minimum number of pulled socks required to guarantee a pair of the same color? By the pigeonhole principle (m = 2, using one pigeonhole per color), the answer is three (n = 3 items). Either you have three of one color, or you have two of one color and one of the other.[citation needed]
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