SOLUTION: how many computer password are possible, using digits: 0-9, a-z(lower case), A-Z (upper case) and !, @, #, $, %, &, *, +. Each character could be used more than one , but the last

Question 443316: how many computer password are possible, using digits: 0-9, a-z(lower case), A-Z (upper case) and !, @, #, $, %, &, *, +. Each character could be used more than one , but the last character have to be from !, @, #, $, %, &, *, +.
Answer by swincher4391(1107) (Show Source): You can put this solution on YOUR website!
Consider these sets:
0-9 has 10 digits
a-z has 26 letters
A-Z has 26 letters
{!,@,#,$,%,&,*,+} has 8 characters:
We have 70 characters in all:
If the number of characters is a fixed length {n characters}, there are possible characters.
Let's say you are given some maximum amount of characters.
Then the number of passwords is represented as
===========
Now I'm thinking this might be too advanced for the level of problem.
Is is possible that you have left out information? Is there a maximum length or fixed length of the password?
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