Question

If the sum of a certain number of terms of the AP 27, 24, 21, 18, …. is –30, find the last term.

Answer 1

To Find: Last term of the AP.

Let the number of terms be n.

Either n = 20 or n = - 1 (n cannot be negative)

Therefore n = 20

Also,

⇒ l = - 30

The last term is - 30.