There are 25 rows of seats in an auditorium the first row is of 20 seats, the second row is of 22 the third row is of 24 seats and so on how many seats are there in the 21st row?
Answers
Answered by
45
Answer: 60
Step-by-step explanation:
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!
Answered by
4
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!
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