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Mathematics 13 Online
OpenStudy (anonymous):

How many 2-letter "words" consist of two different letters arranged in alphabetical order? (Any two letters together is considered a "word.")

OpenStudy (larseighner):

The first letter can be chosen 26 different ways, and the second letter can be chosen 25 ways. But this includes each 2-letter combination two ways, you know how to fix that.

OpenStudy (kropot72):

The solution can also be expressed as: \[\frac{P(26, 2)}{2}\]

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