Answer should be C

explanation:

_ _ _ I have three places to fill for numerals(0-9) their are 10 choices ,26 choice for small alphabet and 26 choice for capital alphabet,

10*26*26

but dont forget all are distinct so we have to multiple it with 3 factorial for different order

10*26*26*3*2=40560

explanation:

_ _ _ I have three places to fill for numerals(0-9) their are 10 choices ,26 choice for small alphabet and 26 choice for capital alphabet,

10*26*26

but dont forget all are distinct so we have to multiple it with 3 factorial for different order

10*26*26*3*2=40560