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If (S_n=8256), what will be (S_{n+5}-S_n)?

Answer and explanation

Correct answer: 655

The sum of the first n natural numbers is \(S_n=\frac{n(n+1)}{2}\). From \(\frac{n(n+1)}{2}=8256\), we get \(n=128\). Therefore, \(S_{n+5}-S_n\) is the sum of the next five numbers: \(129+130+131+132+133=655\). A value such as 645 results from choosing an incorrect starting term. Exam tip: first find \(n\), then list the terms added beyond \(S_n\).

Related tags

Sequences And ProgressionsSum Of Natural NumbersArithmetic SeriesSuccessive TermsClass 9 MathematicsSum Of First N Natural NumbersMathematicsClass 9 Mcq

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