Question

John is choosing a password for his access to the internet. He decided not to use the digit 0 or the letter M. Each letter or number may be used more than once. How many passwords of 2 letters followed by 4 digits are possible?

Answer 1

25 letters for first spot
25 letters for second spot
$25 ^{2} = 625$
9 numbers 
$9 ^{4} = 6561$
6561 times 625
=4,100,625