Question

How many terms of the A.P. 18,16,14 .......be taken so their sum is zero?

Answer 1

A=18
D=16-18
=-2

Ap=a+(n-1)d
0 =18+(n-1)×(-2)
-18=(n-1)(-2)
9=n-1
N=10

Ans is 10

Answer 2

the following ap is 10 terms