This is a large word problem. I have stared at it for 2 days and I just can't wrap my mind around where to start. Any help in the right direction would be greatly appreciated!
Suppose that for a given computer, a password must satisfy each of the following conditions:
1) The password must be between 2 and 6 characters
2) The first character must be a letter and the last character must be a digit between 0 & 9.
3) for passwords with 3 or more characters, all characters except for the first or last may be either a letter or a digit.
4) repetition is allowed.
5) they are not case sensitive.
How many passwords are possible for this computer?
I did it like this:
(26C4)+(36C3)+(36C2)+(10C1)=26300. This does not look right to me!!