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If (S_n-S_{n-1}=225), what will be the value of (S_{n+1})?

Answer and explanation

Correct answer: 25651

For the sum of the first n natural numbers, \(S_n-S_{n-1}=n\), because the new term added to \(S_{n-1}\) is n. Hence, \(n=225\). Therefore, \(S_{n+1}=S_{226}=\frac{226\times227}{2}=25651\). Option A may seem close to \(S_{225}\), but the question asks for the next sum, \(S_{226}\). Exam tip: In such questions, identify \(S_n-S_{n-1}\) directly as n.

Related tags

Sequences And ProgressionsSum Of Natural NumbersFinite SumsAlgebraNumber SequencesSum Of First N Natural NumbersMathematicsClass 9 Mcq

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