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in Arithmetic Progression by (40.3k points)
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A meeting hall has 20 seats in the first row, 24 seats in the second row, 28 seats in the third row, and so on and has in all 30 rows. How many seats are there in the meeting hall?

1 Answer

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by (38.4k points)
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Best answer

The number of seats arranged row-wise are as follows:

20, 24, 28, …

This sequence is an A.P. with a = 20, d = 4, n = 30.

\(\therefore\) The number of seats in the meeting hall is 2340.

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