Mathematics, 09.09.2020 22:01 ijohnh14
(a) 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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(a) To log on to a certain computer account, the user must type in a 4-letter password. In such a pa...
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