Changes

*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