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There is an auditorium with 35 rows of seats. There are 20 seats in the first row,22 seats in the second row, 24 seats in the third row and so on. Find the number ofseats in the twenty-second row. |
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Answer» this is a Arithmetic seriesa= 20d= 2n= 35 total rowsS₂₂=n/2[2 a+(22-1)d] = 35/2[ 40+21*2]35/2[ 40+42]35/2*821435 seats are there |
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