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If \(S_n\) is the sum of the first \(n\) natural numbers, which recurrence relation is always correct for \(n\ge2\)?

Answer and explanation

Correct answer: \(S_n=S_{n-1}+n\)

To obtain the sum of the first \(n\) natural numbers from \(S_{n-1}\), add the new term \(n\). Hence \(S_n=S_{n-1}+n\). Option B adds the previous term instead. Exam tip: compare consecutive partial sums to identify the added term.

Related tags

Natural NumbersPartial SumsRecurrence RelationSequencesProgressionsClass 9 MathematicsSum Of First N Natural NumbersSequences And Progressions

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