SOLUTION: How many three different letter combinations can be formed in the English alphabet?

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Question 631374: How many three different letter combinations can be formed in the English alphabet?
Answer by 303795(602) About Me  (Show Source):
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There are 26 ways of choosing the first letter.
There are 25 ways of choosing the second letter as it cannot duplicate the first letter.
There are 24 ways of choosing the third letter as it cannot duplicate either the first or second letter.
The total number of different combinations is 26 x 25 x 24 = 15600