In combinatorics, is interpreted as the number of -element subsets (the -combinations) of an -element set, that is the number of ways that things can be "chosen" from a set of things. Hence, is often read as " choose " and is called the choose function of and . The notation was introduced by Andreas von Ettingshausen in 1826, although the numbers were already known centuries before that (see Pascal's triangle). Alternative notations include , in all of which the stands for combinations or choices.
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