Worked example

Operation: Combination nCr
n: 52
r: 5

→ 2598960

Method and scope

Exact integer results for 0≤r≤n≤2,000. Combinations ignore order; permutations count order without repetition. 0!=1. The limit bounds computation and output size.

C(n,r)=n!/(r!(n−r)!); P(n,r)=n!/(n−r)!

Precision and limits

≈ marks an approximation. Display rounding does not change the internal calculation.

Sources