Select 15 unique numbers from 5 to 20
        Total possible combinations (ways)
        
If order does not matter (e.g. most lottery numbers): 16
If order matters (e.g. pick3 numbers, permutations, lock combinations, pin-codes): 20,922,789,888,000 (~21 trillion)
            
                If order does not matter (e.g. most lottery numbers): 16
If order matters (e.g. pick3 numbers, permutations, lock combinations, pin-codes): 20,922,789,888,000 (~21 trillion)



