Suppose that the alphabet consists of 26 - lowercase and 26 uppercase. I want to how to do I solve it properly.

Find the Tollowing. How many 8-character passwords can be made consisting of A- 8 different lower-case letters? B- 8 different letters, some may be upper-case, and it is case-sensitive? C- any 8 letters, upper- or lower-case, and it is case-sensitive? D- any 8 characters including letters and digits? E- 8 different characters including letters and digits, but the first letter has to start with a capital letter