How many terms of the A.P. 27, 24, 21, … should be taken so that the

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

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

Answer»

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.

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

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