Python | sympy.nC() method

With the help of sympy.nC() method, we can calculate the number of combinations of a given length in SymPy.

Syntax: nC(items, k)

Parameter:
items – An integer, a list or a string upon which combinations is to be calculated.
k – An integer specifying the length of the combinations.

Returns: Returns the number of combinations of a given length.

Example #1:

# import sympy
from sympy import *

items = "abca"
k = 3
print("Value of k = {} and the items are = {}".format(k, items))

# Use sympy.nC() method
combinations = nC(items, k)

print("Combinations : {}".format(combinations))

Output:

Value of k = 3 and the items are = abca
Combinations : 3

Example #2:

# import sympy
from sympy import *

items = [2, 1, 3, 5, 4]
k = 3
print("Value of k = {} and the items are = {}".format(k, items))

# Use sympy.nC() method
combinations = nC(items, k)

print("Combinations : {}".format(combinations))

Output:

Value of k = 3 and the items are = [2, 1, 3, 5, 4]
Combinations : 10