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

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If (S_n=4095), what will be the value of (n)?

Answer and explanation

Correct answer: (90)

(S_{90}=\frac{90\times91}{2}=4095), so (n=90). Matching (2S_n) with a consecutive product is useful.

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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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