Select 5 unique numbers from 15 to 20
Total possible combinations (ways)
If order does not matter (e.g. most lottery numbers): 6
If order matters (e.g. pick3 numbers, permutations, lock combinations, pin-codes): 720
If order does not matter (e.g. most lottery numbers): 6
If order matters (e.g. pick3 numbers, permutations, lock combinations, pin-codes): 720