Select 20 unique numbers from 1 to 15
        Total possible combinations (ways)
        
If order does not matter (e.g. most lottery numbers): 1,391,975,640 (~1 billion)
If order matters (e.g. pick3 numbers, permutations, lock combinations, pin-codes): 332,525,673,007,965,127,311,360 (~333 sextillion)
            
                If order does not matter (e.g. most lottery numbers): 1,391,975,640 (~1 billion)
If order matters (e.g. pick3 numbers, permutations, lock combinations, pin-codes): 332,525,673,007,965,127,311,360 (~333 sextillion)



