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

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If (S_n+S_{n-2}=10000) and (S_n-S_{n-2}=199), what will (S_n) be?

Answer and explanation

Correct answer: (5099.5)

Adding the two equations gives (2S_n=10199), so (S_n=5099.5). Such values also help check the consistency of the question.

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Sequences Progressions Natural-Numbers Equation Sum Of First N Natural Numbers Sequences And Progressions Mathematics Class 9 Mcq

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