Question

3. Which term of the AP, 21, 18, 15, ... is-81?​

Answer 1

hope it will help you ....

Answer 2

Answer:

a=21

d=-3

an=-81

we know

an=a+(n-1)d

-81=21+(n-1)-3

(n-1)-3=-81-21

(n-1)-3=-102

(n-1)=-102/-3

n-1=34

n=35th term