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binomial coefficient
Any of the coefficients of the powers of x or y in the expansion (see binomial theorem) of (x + y)n.
The binomial coefficient of a typical term x(n - m)ym, written nCm, or (mn), gives the number of ways of picking m unordered outcomes from n possibilities, and is also known as a combination. It has the value n!/(n - m)!m!
The binomial coefficients form the rows of Pascal's triangle.
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