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If \(S_n\) denotes the sum of the first \(n\) natural numbers, which of the following relations is true for \(n>1\)?

Answer and explanation

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

\(S_n\) includes terms from 1 to \(n\), whereas \(S_{n-1}\) includes terms from 1 to \(n-1\). On subtraction, only \(n\) remains. \(2n-1\) is the difference of consecutive square sums. Exam tip: subtract successive sums to identify the added term.

Related tags

Natural NumbersSum FormulaSequencesProgressionsSuccessive TermsNumber PatternsSum Of First N Natural NumbersSequences And Progressions

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