Question

The 19th team of as is 28 and team is 68 what is its nth team and find 25th team?
(Answe)
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Answer 1

Answer:

C

a

2

=−8, a

n

=5n−18

Let a and d be the first term and the common difference of the given AP respectively. Then,

a

6

=12⇒a+5d=12 ...(1)

a

8

=22⇒a+7d=22 ...(2)

On subtracting (2) from (1), we get

2d=10⇒d=5

Putting d=5 in (1), we get

a=12−5×5=−13

Now, a

2

=a+d=−13+5=−8 and

a

n

=a+(n−1)d

=−13+(n−1)×5

=5n−18