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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_{25}+S_{35}+S_{45})?

Answer and explanation

Correct answer: (1990)

(S_{25}=325), (S_{35}=630), and (S_{45}=1035), so the total is (1990). Write all three sums separately and add.

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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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