Question: In Exercises 1720, does the problem involve permutations or combinations? Explain your answer. How many different four-letter passwords can be formed from the letters A,

In Exercises 17–20, does the problem involve permutations or combinations? Explain your answer.

How many different four-letter passwords can be formed from the letters A, B, C, D, E, F, and G if no repetition of letters is allowed?

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