8. 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 seats are there in the stron
sea
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Answered by
1
Answer:
13 stron are therebdhebdbbsjs
Answered by
1
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!
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