Question: Section 2 [20 pts (3, 7, 10)]: Counting 1. Given the set of nine letters ABCDEFGHI to choose from, how many sequences of length 4

Section 2 [20 pts (3, 7, 10)]: Counting 1. Given the set of nine letters ABCDEFGHI to choose from, how many sequences of length 4 are possible assuming that letters can be repeated? For example, some possible sequences are: BCDE, AAAA, FGFH, and BABB. A simple expression suffices for an

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