Question

If the sum of the first x terms of the AP: 123, 120, 117,..… is 0, then what is the value of x?​

Answer 1

Step-by-step explanation:

n=X

d=120-123=-3

a=123

0=X/2(123*2(x-1)*-3)

0=246+-3(x-1)

83=x