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Laksh
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Asked: 2020-12-28T03:48:54+00:00 In:

Find the sum of the following APs: 2, 7, 12, . . ., to 10 terms.

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NCERT Solutions for Class 10 Maths Chapter 5
Important NCERT Questions
Arithmetic Progression
NCERT Books for Session 2022-2023
CBSE Board and UP Board Others state Board
EXERCISE 5.3
Page No:107
Questions No:1

2020-2021arithmetic progressioncbsechapter 5class10mathematicsncert
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    1. Best Answer

      A.P.: 2, 7, 12, …
      Here, a = 2 and d = 7 – 2 = 5
      The sum of n terms of an AP is Given by
      Sn = n/2[2a + (n -1)d]
      ⇒ S_10 = 10/2[2(2) + (10 – 1)(5)]
      ⇒ S_10 = 5[4 + 45] = 245.

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    2. Get Hindi Medium and English Medium NCERT Solution for Class 10 Maths to download.
      Please follow the link to visit website for first and second term exams solutions.
      https://www.tiwariacademy.com/ncert-solutions/class-10/maths/chapter-5/

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