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

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If (S_{n+3}-S_{n-3}=615), what will be the value of (n)?

Answer and explanation

Correct answer: (102)

The difference is ((n-2)+(n-1)+n+(n+1)+(n+2)+(n+3)=6n+3), and (6n+3=615) gives (n=102). Form the sum of the six middle terms.

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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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