A passcode consists of 2 capital letters A-Z followed by 4 numbers 0-9

Question

A) how many possible passcode options are there?

B) how many different passcodes can be made without repeats?

C) what is the probability that a randomly selected passcode will have no repeated characters?

Answer 1

A) 26 * 26 * 10 * 10 * 10 * 10 = 6,760,000

B) 26 * 25 * 10 * 9 * 8 * 7 = 3,276,000

C) 3,276,000/6,760,000 = 0.4846