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Which of the following relations is correct for \(S_n\), the sum of the first \(n\) natural numbers?

Answer and explanation

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

\(S_n=1+2+\cdots+(n-1)+n\), whereas \(S_{n-1}=1+2+\cdots+(n-1)\). On subtraction, only \(n\) remains. \(n-1\) is the last term of the previous sum. Exam tip: the difference of consecutive sums gives the newly added term.

Related tags

Natural NumbersSequencesProgressionsSum Of N TermsMathematical RelationsSum Of First N Natural NumbersSequences And ProgressionsMathematics

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