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An auditorium has 50 rows of seats. The first row contains 30 seats. As you move to the rear of the auditorium, each row

An auditorium has 50 rows of seats. The first row contains 30 seats. As you move to the rear of the auditorium, each row has 7 more seats than the previous row. How many seats are in the row 31? How many seats are in the auditorium?

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