There are 25 rows of seats in an auditorium. The first row is of 20 seats, the second of 22 seats, the third of 24 seats, and so on. How many chairs are there in the 21st row ?
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Answered by
184
Answer: 60.
Step-by-step explanation:
The number of seats will be in the following order-
20, 22, 24,.........
It clearly forms an arithmetic sequence.
From the question, you have
a= 20 (first term), d= 2 (common diff)
n=21 (asked) , t21=?
The formula of general term is
tn = a+(n-1)d
t21 = 20+(21-1)2
= 20+ (20)2
= 20+40
= 60.
Hope I helped you!
pmistry2609:
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Thank you!
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