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

Answer and explanation

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

\(S_n\) has the extra final term \(n\) beyond \(S_{n-1}\), so their difference is \(n\). Thus A is correct; B gives the previous term. Exam tip: consecutive sums differ by the newly added term.

Related tags

Natural NumbersSum Of N TermsSequences And ProgressionsConsecutive SumsSum Of First N Natural NumbersMathematicsClass 9 Mcq

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