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

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For which (n) will (S_n=1081)?

Answer and explanation

Correct answer: (46)

(S_{46}=\frac{46\times47}{2}=1081), so (n=46). Checking with options is useful for larger sums.

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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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