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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. 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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    2. 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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