counting question

Question

A password is required to log into a system that only recognizes numbers and letters of the alphabet (not case sensitive). You want to create a password using 4 numbers or letters, but cannot reuse any of them.

How many different passwords are possible?

Answer 1

Hi Kate,

 

you sure have one big assignment

 

there are 26 letters and 10 numbers (36 total) to choose from for the first choice, then 35, then 34, then 33

 

36·35·34·33 = 1,413,720

 

:)