Select 7 unique numbers from 1 to 645
        Total possible combinations (ways)
        
If order does not matter (e.g. most lottery numbers): 8,918,666,166,467,520 (~9 quadrillion)
If order matters (e.g. pick3 numbers, permutations, lock combinations, pin-codes): 44,950,077,478,996,303,872 (~45 quintillion)
            
                If order does not matter (e.g. most lottery numbers): 8,918,666,166,467,520 (~9 quadrillion)
If order matters (e.g. pick3 numbers, permutations, lock combinations, pin-codes): 44,950,077,478,996,303,872 (~45 quintillion)



