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If (S_{23}=276), what will be the value of (S_{25})?

Answer and explanation

Correct answer: \(325\)

Here, \(S_n\) denotes the sum of the first \(n\) natural numbers. Therefore, \(S_{25}=S_{23}+24+25=276+49=325\). Hence, the correct option is \(325\). A value such as \(300\) can result from the mistake of adding only one new term. Exam tip: When moving from \(S_n\) to \(S_{n+k}\), add every intervening new term.

Related tags

MathematicsSequences And ProgressionsNatural NumbersSum Of N TermsSeriesSum Of First N Natural NumbersClass 9 Mcq

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