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Subject - Mathematics:

Arithmetic Progression

MCQ - 444-9176

Question:

The sum of first n terms of an AP is (4n2 + 2n). The nth term of this AP is

  1. (6n – 2)
  2. (7n – 3)
  3. (8n – 2)
  4. (7n – 3)

Correct Answer: C

Explanation:

Let Sn denotes the sum of first n terms of an AP.
Sum of first n terms = Sn = 4n2 + 2n
Then nth term is given by: an = Sn - Sn - 1
∴ an = (4n2 + 2n) - [4(n - 1)2 + 2(n - 1)]
= (4n2 + 2n) - [4(n2 + 1 - 2n) + 2n - 2]
= 4n2 + 2n - 4n2 - 4 + 8n - 2n + 2
= 8n - 2

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504 MCQ for effective preparation of the test of Arithmetic Progression of Mathematics section.

Read the MCQ statement: The sum of first n terms of an AP is (4n2 + 2n). The nth term of this AP is , keenly and apply the method you have learn through the video lessons for Arithmetic Progression to give the answer. Record your answer and check its correct answer and video explanation for MCQ No. 444-9176.

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