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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