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How many different three-letter sets of initials are possible using the letters \(A\) through \(O\)?

 Jan 31, 2022
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If all three letters must be different, 

there are 15 choices for the first letter,

14 choices for the second letter, and

13 choices for the third letter.

So, the total number of choices is:  15 x 14 x 13 = ...

 Jan 31, 2022

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