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deepaksoni
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Asked: 2021-04-29T07:25:17+05:30 In:

Problem 1: Write the first terms of each of the following sequences whose nth term is:(vi) an = n(n – 2)/2

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This is arithmetic progression based question from Chapter name- Arithmetic Progression
Chapter number- 9
Exercise – 9.1

In this question we have been given the nth term n(n-2)/2 of any arithmetic series and we have to find the first term of the series.

CBSE DHANPAT RAI PUBLICATIONS
Understanding CBSE Mathematics
Class :- 10th
Question no 1 (vi )

apclass 10thrd sharma
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    1. Guru

      Solution:

      Given:

      By putting n = 1, 2, 3, 4, 5 we get first five term of the sequence

      a1 = (1.( 1 – 2))/2 = -1/2

      a2 = (2.(2 – 2))/2 = 0

      a3 = (3.(3 – 2))/2 = 3/2

      a4 = (4.(4 – 2))/2 = 4

      a5 = (5.(5 – 2))/2 =15/2

      ∴ The first five terms are -1/2, 0, 3/2, 4, 15/2

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