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

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If (S_n=5460), what will be the value of (n)?

Answer and explanation

Correct answer: (104)

(S_{104}=\frac{104\times105}{2}=5460), so (n=104). Match (2S_n) with the product of consecutive numbers.

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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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