Editing Pigeonhole principle (section)

=== Sock picking ===
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 ({{math|''m'' {{=}} 2}}, using one pigeonhole per color), the answer is three ({{math|''n'' {{=}} 3}} items). Either you have ''three'' of one color, or you have ''two'' of one color and ''one'' of the other.{{Citation needed|date=February 2025}}