Question 1177599: Supposed your computer password must contain four characters, must begin with a letter, and may contain digits and letters only. How many different passwords can you create. (Note that in a password, upper case letters are different from lower case letters.)
Answer by ikleyn(52781)   (Show Source):
You can put this solution on YOUR website! .
At the beginning position, we have 26^2 = 52 opportunities with the letters;
and at each of the other positions we have 52 + 10 opportunities.
So, in all, there are 52*62^3 = 12393056 different passwords.
Solved, answered, explained and completed.
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