Mathematics, 20.10.2020 19:01 asialoggin21

A theater has 15 seats in the first row, 18 in the second row, 21 in the third row, and so on for 20 rows. How many seats are in the last row?

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A theater has 15 seats in the first row, 18 in the second row, 21 in the third row, and so on for 20...

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