A computer password is required to be 5 characters long. How many passwords are possible if the password requires 2 letter(s) followed by 3 digits (numbers 0-9), where no repetition of any letter or digit is allowed?
Added by Leo G.
Step 1
There are 26 letters in the English alphabet. Since no repetition is allowed, the first letter can be any of the 26 letters and the second letter can be any of the remaining 25 letters. So, there are 26*25 = 650 ways to choose the letters. Show more…
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