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# Python | sympy.binomial() method

• Last Updated : 07 Jul, 2019

With the help of sympy.binomial() method, we can find the number of ways to choose k items from a set of n distinct items. It is also often written as nCk, and is pronounced “n choose k”.

(1)

Syntax: binomial(N, K)

Parameters:
N – It denotes the number of items to choose from.
K – It denotes the number of items to choose.

Returns: Returns the number of ways to choose K items from a set of N distinct items

Example #1:

 # import sympy from sympy import *   N = 4K = 2 print("N = {}, K = {}".format(N, K))   # Use sympy.binomial() method comb = binomial(N, K)        print("N choose K : {}".format(comb))

Output:

N = 4, K = 2
N choose K : 6


Example #2:

 # import sympy from sympy import *   N, K = symbols('A B')  print("N = {}, K = {}".format(N, K))   # Use sympy.binomial() method comb = binomial(N, K)        print("N choose K : {}".format(comb))

Output:

N = A, K = B
N choose K : binomial(A, B)


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