Question

The 9th term of the AP -15 ,-11,-7....49 is
​

Answer 1

Answer:

a=−11

d=4

49=−11+(n−1)4

60=4n−4

64=4n

n=16⟶ there are 16 terms.

Since the terms are even, there will be two middle most terms.

∴n=8,9

When n=8,a

8

​

=17

n=9,a

9

​

=21

∴a

0,9

​

=

2

17+21

​

=19

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Step-by-step explanation: