Mathematics, 27.03.2020 09:17 pacangel

An amphitheatre has 15 seats in the first row, 19 in the second, 23 in the third, and so on, for 34 rows. How many seats are in the amphitheatre?

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An amphitheatre has 15 seats in the first row, 19 in the second, 23 in the third, and so on, for 34...