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Class 9 Mathematics Sequences and Progressions Sum of first n natural numbersHard

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What is the value of (S_{70}+S_{71}-S_{69})?

Answer and explanation

Correct answer: (2626)

(S_{70}=2485), (S_{71}=2556), and (S_{69}=2415), so the value is (2626). Subtract carefully with nearby indices.

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Math Sequences Natural-Numbers Sum Sum Of First N Natural Numbers Sequences And Progressions Mathematics Class 9 Mcq

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