Learn all Concepts of Chapter 5 Class 10 (with VIDEOS). Check - Arithmetic Progressions - Class 10

Last updated at Aug. 26, 2020 by Teachoo

Transcript

Ex 5.3 ,13 Find the sum of first 15 multiples of 8. Multiples of 8 are 8, 16, 24,โฆ Since difference is same, it is an AP We need to find sum of first 15 multiples We use formula Sn = ๐/2 (2๐+(๐โ1)๐) Here, n = 15, a = 8 & d = 16 โ 8 = 8 Putting values in formula Sn = ๐/2 (2๐+(๐โ1)๐) = 15/2(2ร8+(15โ1)ร8) = 15/2 (16+14ร8) = 15/2 (16+112) = 15/2ร128 = 960 Therefore, the sum of first 15 multiples of 8 is 960

Ex 5.3

Ex 5.3, 1

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Ex 5.3, 6 Important

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Ex 5.3, 10 Important

Ex 5.3, 11 Important

Ex 5.3, 12

Ex 5.3, 13 You are here

Ex 5.3, 14

Ex 5.3, 15 Not in Syllabus - CBSE Exams 2021

Ex 5.3, 16 Not in Syllabus - CBSE Exams 2021

Ex 5.3, 17 Not in Syllabus - CBSE Exams 2021

Ex 5.3, 18 Important Not in Syllabus - CBSE Exams 2021

Ex 5.3, 19

Ex 5.3, 20 Important

Chapter 5 Class 10 Arithmetic Progressions

Serial order wise

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Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.