Select 2 unique numbers from 0 to 17
        Total possible combinations (ways)
        
If order does not matter (e.g. most lottery numbers): 153
If order matters (e.g. pick3 numbers, permutations, lock combinations, pin-codes): 306
            
                If order does not matter (e.g. most lottery numbers): 153
If order matters (e.g. pick3 numbers, permutations, lock combinations, pin-codes): 306



