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deepaksoni
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Asked: 2021-04-30T07:10:55+05:30 In:

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)

arithmetic progressionsclass 10thrd sharma
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    1 Answer

    1. Guru

      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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