Select 1 unique numbers from 20 to 40
Total possible combinations (ways)
If order does not matter (e.g. most lottery numbers): 21
If order matters (e.g. pick3 numbers, permutations, lock combinations, pin-codes): 21
If order does not matter (e.g. most lottery numbers): 21
If order matters (e.g. pick3 numbers, permutations, lock combinations, pin-codes): 21
