Question

Which term of 21 18 15..... is -81

Answer 1

Answer:

the answer is 35=n

Hope it helps you mark me as brainliest if you think my answer is appropriate!!!

Answer 2

Answer: n = 35

Step-by-step explanation:

a = 21, d = (-3),

Let, (-81) be the nth term.

So, An = (-81)

An = a + (n - 1)d

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

-102 = (n - 1)(-3)

n - 1 = 34

n = 35

So, the 35th term of this AP is (-81).

NOTE :- It was not possible to write a to the subscript of n, so I wrote An instead of a to the subscript of n.