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A binomial coefficient is a coefficient of any of the terms in the expansion of the binomial (x+y)^n.
The binomial theorem describes the algebraic expansion of powers of a binomial: that is, the expansion of an expression of the form (x + y)^n where x and y are variables and n is the power to which the binomial is raised. When first encountered, n is a positive integer, but the binomial theorem can be extended to cover values of n which are fractional or negative (or both).
The binomial theorem describes the algebraic expansion of powers of a binomial, hence it is referred to as binomial expansion.
X + Y⁶X + Y * Y * Y * Y * Y * Y
The coefficients of the binomial expansion of (1 + x)n for a positive integer n is the nth row of Pascal's triangle.