Combination Calculator (nCr)

Calculate combinations using the formula C(n, r) = n! / (r! * (n - r)!). Combinations count the number of ways to choose items where order does not matter.

Inputs

Total Items (n)

Items Chosen (r)

Results

Combinations (nCr)

120

Formula

C(10, 3) = 10! / (3! × 7!)

n!

3,628,800

r!

6

(n-r)!

5,040

Frequently Asked Questions

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Calculate basic probability from favorable outcomes divided by total outcomes.