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What is obtained by adding (30) and (31) to the sum of the first (29) natural numbers?

Answer and explanation

Correct answer: \(S_{31}\)

If \(S_n\) denotes the sum of the first \(n\) natural numbers, then adding the next two numbers to \(S_{29}\) gives \(S_{29}+30+31=S_{31}\). \(S_{30}\) includes only up to 30, so it is not correct. Exam tip: when consecutive next terms are added to a partial sum, increase the subscript accordingly.

Related tags

MathematicsSequencesProgressionsNatural NumbersPartial SumsSum Of Natural NumbersSum Of First N Natural NumbersSequences And Progressions

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