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

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If (S_n+S_{n-1}=1561) and (S_n-S_{n-1}=40), which is the value of (S_n)?

Answer and explanation

Correct answer: (800.5)

Adding the two equations gives (2S_n=1601), so (S_n=800.5). If an integer is not obtained, check the consistency of given values.

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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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