Probability sat

Question

For some particular website, the password must start with A or B there must be 5 more characters, and each of the characters may be a numeric digit or letter of the alphabet how many diffrent passwords are possible

Answer 1

There are 2 ways to choose the first character A or B. For the next characters there are 10 digits (0-9) and 26 letters available (considering no distinction between upper and lower case)

1. Assuming the characters can repeat you would have 2 * 36 * 36 * 36 * 36 * 36 possible passwords.
2. If the characters can't be repeated then A or B are used up so you would have 2 * 35 * 34 * 33 * 32 * 31 possible passwords.

What if upper and lower case letters are considered distinct. How many passwords could you make in that case?