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Question 4 (10 points)  Given an alphabet ∑ = {a, b, c, d}. How many strings of length 4 are in ∑*, such that each string contains each of the four letters exactly once?

/in /by

Question 4 (10 points)
Given an alphabet ∑ = {a, b, c, d}. How many strings of length 4 are in ∑*, such that each string contains each of the four letters exactly once?
Question 4 options:

24

4

36

16

 
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