Select 2 unique numbers from 1 to 1000000000000000000000000
Total possible combinations (ways)
If order does not matter (e.g. most lottery numbers): 500,000,000,000,000,021,922,921,522,538,098,677,317,023,825,920 (~5.0E+29 million trillion)
If order matters (e.g. pick3 numbers, permutations, lock combinations, pin-codes): 1,000,000,000,000,000,043,845,843,045,076,197,354,634,047,651,840 (~1.0E+30 million trillion)
If order does not matter (e.g. most lottery numbers): 500,000,000,000,000,021,922,921,522,538,098,677,317,023,825,920 (~5.0E+29 million trillion)
If order matters (e.g. pick3 numbers, permutations, lock combinations, pin-codes): 1,000,000,000,000,000,043,845,843,045,076,197,354,634,047,651,840 (~1.0E+30 million trillion)