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Question 17 (5 points)

Repetition of first letter Answers and Explanation

Case a)

In this case, the first letter must be either G, T, or K, and no letter may be repeated. This means we have three choices for the first letter. Once the first letter is chosen, we have 25 remaining letters from which to choose the second letter. For the third letter, we have 24 remaining letters, and so on. Therefore, the total number of possible words is:

Results:

3 24

4 23

1 3 (G, T, or K)

2 26