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

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If (S_n=7875), what is the value of (n)?

Answer and explanation

Correct answer: (125)

(S_{125}=\frac{125\times126}{2}=7875), so (n=125). For large values, using (2S_n) makes identification easier.

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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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