Enter a number to choose from (n) and a number chosen (k) to calculate the
combinations.
Combination is a selection of a certain number of objects from a group without
an order. For example, if you have to choose 2 letters from A, B and C, then
the combinations (how many times you can select 2 different letters) can be 3
since the order does not matter. It can be AB, AC, and BC. AB and BA are the
same in combinations calculation.
The formula to calculate the combinations is :
C(n,k) = n! / (n-k)! * k!