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To log on to a certain computer account, the user must type in a 4-letter password. In such a password, no letter may be repeated, and only the lower case of a letter may be used. How many such 4-letter passwords are possible? (There are 26 letters in the alphabet.)

 Sep 8, 2020
 #1
avatar+26951 
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26 choices for first letter

   25 choices for second letter

       24 choices for third letter

           23 choices for last letter

 

 

26  x  25  x  24  x 23 = ........... choices

 Sep 8, 2020
 #2
avatar+230 
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26*25*24*23=358800

 Sep 8, 2020

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