How many terms of Arithmetic Progression (A. P.) 21, 18, 15, 12, ... must be taken to give the sum zero?

1. How many terms of Arithmetic Progression (A. P.) 21, 18, 15, 12, ... must be taken to give the sum zero?

[Senior Officer 2019 [MCQ] : 2019]

1. 10

2. 15

3. 22

4. 27

Answer

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