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Let \(S_n\) denote the sum of the first n natural numbers. What is \(S_{n+1}-S_n\) when the next natural number is included in the sum?

Answer and explanation

Correct answer: \(n+1\)

After the first n numbers, the next natural number is \(n+1\). Hence \(S_{n+1}=S_n+(n+1)\), so the difference is \(n+1\), not n. Exam tip: compare consecutive sums by identifying the newly added term.

Related tags

Natural NumbersConsecutive SumsSequencesProgressionsSum FormulaSum Of First N Natural NumbersSequences And ProgressionsMathematics

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