Learn all Concepts of Chapter 5 Class 10 (with VIDEOS). Check - Arithmetic Progressions - Class 10
Ex 5.3, 13 - Chapter 5 Class 10 Arithmetic Progressions
Last updated at March 22, 2021 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 = ๐/๐ (๐๐+(๐โ๐)๐ ) = 15/2(2 ร 8+(15โ1) ร 8) = 15/2 (16+14 ร 8) = 15/2 (16+112) = 15/2 ร 128 = 960 Therefore, the sum of first 15 multiples of 8 is 960
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Ex 5.3, 6 Important
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Ex 5.3, 13 You are here
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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
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Ex 5.3, 20 Important
Chapter 5 Class 10 Arithmetic Progressions
Serial order wise
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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.