def binomial_Coeff(n,k):
     
    if k > n : 
       return 0
    if k==0 or k ==n : 
        return 1 
    return binomial_Coeff(n-1,k-1) + binomial_Coeff(n-1,k) 
def binomial_Coeff(n,k):
     
    if k > n : 
       return 0
    if k==0 or k ==n : 
        return 1 
    return binomial_Coeff(n+1,k-1) + binomial_Coeff(n-1,k) 