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There are 25 rows pf seats in an auditorium. The 1st row is 20 seats, the 2nd row of 22 seats, the 3rd row of 24 seats and so on. How many seats are there in the 21st row.
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Which is an A. P. Here, a = 20, d = 2. We want to find t21. ∴ There are 60 chairs in the 21st row.
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Step-by-step explanation:
Which is an A. P. Here, a = 20, d = 2. We want to find t21. ∴ There are 60 chairs in the 21st row.
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