`scipy.special._basic:comb`

Signature

def comb(N, k, *, exact = False, repetition = False)

The number of combinations of N things taken k at a time.

This is often expressed as "N choose k".

N : int, ndarray: Number of things.
k : int, ndarray: Number of elements taken.
exact : bool, optional: For integers, if exact is False, then floating point precision is used, otherwise the result is computed exactly.
repetition : bool, optional: If repetition is True, then the number of combinations with repetition is computed.

import numpy as np
from scipy.special import comb
k = np.array([3, 4])
n = np.array([10, 10])

✓

comb(n, k, exact=False)

✗

array([120., 210.])

comb(10, 3, exact=True)
comb(10, 3, exact=True, repetition=True)