Question

6. Which term of the ap : 21, 18, 15, . . . Is 81?

Answer 1

Answer:

35th term of the AP is - 81

Step-by-step explanation:

The question should be to find - 81 because if it is 81, n will be negative which is impossible

A = 21

An = - 81

d = - 3

An = A + (n-1)d

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

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

-102/-3 = n-1

34 = n-1

n = 35

35th term is - 81

Answer 2

plz refer to this attachment