Answer: In Exercises 17-20, does the problem hwolve permutations or combinations Explain
Chapter 8, Problem 19(choose chapter or problem)
In Exercises 17-20, does the problem hwolve permutations or combinations? Explain your answer. (It is not necessary to solve the problem.) How many different four-letter passwords can be formed from the tellers A, B, C, D, E, F, and G if no repetition of letters is allowed?
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