Question

How many terms of the A.P. 27, 24, 21, … should be taken so that their sum is zero?

Answer 1

Answer:

Here d = - 3, a = 27

Sn = 0

=> n/2 [2a + (n - 1) d ] = 0

=> 2 (27) + (n - 1) (-3) = 0

=> n - 1 = 18

=> n = 19

Therefore, 19 terms should be taken to get the sum zero.

Answer 2

QuestioN :

How many terms of the A.P. 27, 24, 21, … should be taken so that their sum is zero?

SolutioN :

"Solution is given in the attachment."