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The numbers of seats in the first 12 rows of a high-school auditorium form an...

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The numbers of seats in the first 12 rows of a high-school auditorium form an arithmetic sequence. The first row has 9 seats. The second row has 11 seats.a. Write a recursive formula to represent the sequence.b. Write an explicit formula to represent the sequence.c. How many seats are in the 12th row?

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