A computer password must be eight characters long. How many passwords are possible if only the 26 letters of the alphabet are allowed with no repetition?
Added by Kimberly L.
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Then, we have 25 options for the second character (since we cannot repeat the first character). Similarly, we have 24 options for the third character, and so on, until we have 19 options for the eighth and final character. Show more…
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