二に項こう係けい数すう

noun

binomial coefficient

A mathematical term for the coefficient of a term in the expansion of a binomial power, often written as nCk or (n choose k).

• 二に項こう係けい数すうは組くみ合あわせの数かずを表あらわすのによく使つかわれる。

  Binomial coefficients are often used to represent the number of combinations.