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A local civic theater has 22 seats in the first row and 21 rows in all. Each successive row contains 3 additional seats. How many seats are in the civic theater?
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22, 25, 28, 31, 34, ...
thats the no. of seats based on rows
21st row will have 22 + (20)3 = 82 seats
22, 25, 28, ... , 82
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