Select 2 unique numbers from 1 to 10000000000000000000000
Total possible combinations (ways)
If order does not matter (e.g. most lottery numbers): 50,000,000,000,000,004,410,680,702,653,211,320,350,932,992 (~5.0E+25 million trillion)
If order matters (e.g. pick3 numbers, permutations, lock combinations, pin-codes): 100,000,000,000,000,008,821,361,405,306,422,640,701,865,984 (~1.0E+26 million trillion)
If order does not matter (e.g. most lottery numbers): 50,000,000,000,000,004,410,680,702,653,211,320,350,932,992 (~5.0E+25 million trillion)
If order matters (e.g. pick3 numbers, permutations, lock combinations, pin-codes): 100,000,000,000,000,008,821,361,405,306,422,640,701,865,984 (~1.0E+26 million trillion)