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

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What is the value of (S_{42}+S_{84}+S_{126})?

Answer and explanation

Correct answer: (12484)

(S_{42}=903), (S_{84}=3570), and (S_{126}=8001), so the total is (12474). 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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