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Which of the following relations is always true for \(S_n\), the sum of the first \(n\) natural numbers, where \(n>1\)?

Answer and explanation

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

\(S_n=1+2+\cdots+(n-1)+n\), while \(S_{n-1}=1+2+\cdots+(n-1)\). On subtracting, all common terms cancel and only \(n\) remains. \(n-1\) is the previous term, not the difference. Exam tip: compare consecutive sums.

Related tags

Natural NumbersSum Of N TermsSequencesProgressionsConsecutive SumsSum Of First N Natural NumbersSequences And ProgressionsMathematics

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