Select 2 unique numbers from 1 to 640
Total possible combinations (ways)
If order does not matter (e.g. most lottery numbers): 204,480 (~204.5 thousand)
If order matters (e.g. pick3 numbers, permutations, lock combinations, pin-codes): 408,960 (~409 thousand)
If order does not matter (e.g. most lottery numbers): 204,480 (~204.5 thousand)
If order matters (e.g. pick3 numbers, permutations, lock combinations, pin-codes): 408,960 (~409 thousand)