Ex 5.3, 3 (x) - Chapter 5 Class 10 Arithmetic Progressions

Last updated at Dec. 16, 2024 by

Ex 5.3, 3 - Chapter 5 Class 10 Arithmetic Progressions - Part 25

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Ex 5.3, 3 In an AP (x) Given 𝑙 = 28, S = 144 and there are total 9 terms. Find a. Given 𝑙 = 28 , S = 144 , n = 9 We can use formula Sn = 𝒏/𝟐 (𝒂+𝒍) Putting Sn = 144, n = 9 & 𝑙 = 28 144 = 9/2(𝑎+28) (144 × 2)/9=𝑎+28 32 =𝑎+28 32 – 28 = a a = 4

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Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science and Computer Science at Teachoo