Permutations (nPr) and Combinations (nCr)
Permutations are the number of possible orders of r objects from a pool of n. Combinations are the number of possible combinations of r objects from a pool of n where order does not matter.
Calculate the number of permutations & combinations of a subgroup r from a total number of objects n.
Permutations are the number of possible orders of r objects from a pool of n. Combinations are the number of possible combinations of r objects from a pool of n where order does not matter.