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Problem 2: Find the indicated terms in each of the following sequences whose nth terms are:(v) an = (-1)n.n; a3, a5, a8

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This is the basic and conceptual question from Chapter name- Arithmetic Progression
Chapter number- 9
Exercise 9.1
We have to find the indicated terms asked in the question whose nth term is (v) an = (-1)n.n

CBSE DHANPAT RAI publications
Class:- 10th
Understanding CBSE Mathematics
Question 2(v)

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1 Answer

  1. Solution:

    Given:

    an = (-1)n.n

    By putting n=3

    a3 = (-1)3.3 = -1.3 = -3

    By putting n=5

    a5 = (-1)5.5 = -1.5 = -5

    By putting n=8

    a8 = (-1)8.8 = 1.8 = 8

    ∴ The required terms a3= -3, a5 = -5 and a8 = 8

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