How man 2 letter code words can be formed from the first 3 letters of he alphabet?

How man 2 letter code words can be formed from the first 3 letters of he alphabet if no letter can be used more than once?
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2 Answers

The number of ways of selecting 2 out of 3 different objects taking into account order is 6: AB, AC, BC, BA, CA, CB.
by Top Rated User (1.2m points)
For the first letter, you have 3 choices. For the second letter, you are left with 2 choices. For the third, only 1 choice.

3 * 2 * 1 = 6
by Level 11 User (78.4k points)

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