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Using the letters  A and B, the following two-letter code words can be formed: AA, AB, BB, BA. Using the letters A, B, and C and D, how many different four-letter code words can be formed?

 Aug 13, 2021
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Using the letters A, B, and C and D, how many different four-letter code words can be formed?    

 

This would be the permutation of 4 things taken 4 at a time, abbreviated 4P4 in math. 

 

There are 4 choices for the 1st letter, 

There are 3 choices for the 2nd letter, 

There are 2 choices for the 3rd letter, 

There remains 1 choice for the 4th.           The total number is 24.  

.

 Aug 13, 2021

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