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*It is the coefficient of the <math>x^k</math> term in the polynomial expansion of the binomial thorem <math>(1 + x)^n</math>.
*It is the coefficient of the <math>x^k</math> term in the polynomial expansion of the binomial thorem <math>(1 + x)^n</math>.
*The coefficient is occur in the formula of binomial thorem:
*The coefficient is occur in the formula of binomial thorem:
<math>(x+y)^n=\sum _{k=0}^n \binom{n}{k} x^{n-k} y^k</math> ,where <math> k\le n</math>.
<math>(x+y)^n=\sum _{k=0}^n \binom{n}{k} x^{n-k} y^k</math> where <math> k\le n</math>.
*To find the coefficient of the binomial ,we can use several methods.
*To find the coefficient of the binomial ,we can use several methods.
1. Recursive formula
1. Recursive formula