Select 20 unique numbers from 1 to 500
Total possible combinations (ways)
If order does not matter (e.g. most lottery numbers): 266,719,851,283,743,756,938,289,922,506,227,712 (~2.6671985128374E+17 million trillion)
If order matters (e.g. pick3 numbers, permutations, lock combinations, pin-codes): 648,903,261,808,794,958,422,778,794,408,915,911,597,573,101,953,482,752 (~6.4890326180879E+35 million trillion)
If order does not matter (e.g. most lottery numbers): 266,719,851,283,743,756,938,289,922,506,227,712 (~2.6671985128374E+17 million trillion)
If order matters (e.g. pick3 numbers, permutations, lock combinations, pin-codes): 648,903,261,808,794,958,422,778,794,408,915,911,597,573,101,953,482,752 (~6.4890326180879E+35 million trillion)