Question: 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

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.)

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