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Dasya
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Asked: 2020-12-24T04:48:51+00:00 In:

Which term of the AP : 3, 8, 13, 18, . . . ,is 78?

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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 5.2
Page No:106
Questions No:4

2020-2021arithmetic progressioncbsechapter 5class10mathematicsncert
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    2 Answers

    1. Best Answer

      Here, a = 3 and d = 8 – 3 = 5.
      Let, nth term of the A.P. is 78.
      Therefore, a_n = 78
      ⇒ a + (n -1)d = 78
      ⇒ 3 + (n -1)(5) = 78
      ⇒ (n – 1)(5) = 75
      ⇒ n – 1 = 15
      ⇒ n = 16
      Hence, 16th term of the A.P .: 3, 8, 13, 18, … is 78.

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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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