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How many passwords are there if a password must be no more than 5 characters long, the characters must be lower case letters, and the first character cannot be an a.

 Oct 5, 2015
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If letters can be repeated, we have  ....  25 x 26^4 = 11,424,400

 

If letters cannot be repeated, we have......   25 x 25 x 24 x 23 x 22  = 7,590,000

 

 

 

cool cool cool

 Oct 5, 2015

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