Question

how many terms of the AP: 27, 24, 21,..... should be taken so that their sum is zero ​

Answer 1

Answer:

0 or 19

Step-by-step explanation:

here the d=-3

a=27

Sn=0

and we need to n.

we know, Sn=n/2(2a+(n-1)d)

0=n/2(2*27-3n+3)

0=n(57-3n)

Therefore, n=0 or 19

Hope u got it