Select 1 unique numbers from 400000001 to 600000000
        Total possible combinations (ways)
        
If order does not matter (e.g. most lottery numbers): 200,000,000 (~200 million)
If order matters (e.g. pick3 numbers, permutations, lock combinations, pin-codes): 200,000,000 (~200 million)
            
                If order does not matter (e.g. most lottery numbers): 200,000,000 (~200 million)
If order matters (e.g. pick3 numbers, permutations, lock combinations, pin-codes): 200,000,000 (~200 million)



