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deepaksoni
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Asked: 2021-04-29T07:04:46+05:30 In:

Problem 1: Write the first terms of each of the following sequences whose nth term is: (i) an = 3n + 2

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One of the most important and exam oriented question from Chapter name- Arithmetic Progression
Class 10th
Chapter number- 9
Exercise :- 9.1
We have to find the first term of given AP where we have been given nth term of that series as (3n+2)

CBSE DHANPAT RAI publications
Understanding CBSE Mathematics
Question 1 ( i)

arithmetic progressionclass10rd sharma
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    1. Guru

      Solution:

      Given:

      an = 3n + 2

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

      a1 = (3 × 1) + 2 = 3 + 2 = 5

      a2 = (3 × 2) + 2 = 6 + 2 = 8

      a3 = (3 × 3) + 2 = 9 + 2 = 11

      a4 = (3 × 4) + 2 = 12 + 2 = 14

      a5 = (3 × 5) + 2 = 15 + 2 = 17

      ∴ The first five terms are 5, 8, 11, 14, 17

       

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