Select 2 unique numbers from 1 to 999999999999999999999999999999999999999999
Total possible combinations (ways)
If order does not matter (e.g. most lottery numbers): 500,000,000,000,000,028,883,304,949,057,948,351,218,633,563,548,032,068,549,020,931,617,356,167,008,462,307,328 (~5.0E+65 million trillion)
If order matters (e.g. pick3 numbers, permutations, lock combinations, pin-codes): 1,000,000,000,000,000,057,766,609,898,115,896,702,437,267,127,096,064,137,098,041,863,234,712,334,016,924,614,656 (~1.0E+66 million trillion)
If order does not matter (e.g. most lottery numbers): 500,000,000,000,000,028,883,304,949,057,948,351,218,633,563,548,032,068,549,020,931,617,356,167,008,462,307,328 (~5.0E+65 million trillion)
If order matters (e.g. pick3 numbers, permutations, lock combinations, pin-codes): 1,000,000,000,000,000,057,766,609,898,115,896,702,437,267,127,096,064,137,098,041,863,234,712,334,016,924,614,656 (~1.0E+66 million trillion)