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Class 9 Mathematics Sequences and Progressions Sum of first n natural numbersExpert

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If (S_n=1225), what will be the value of (S_{2n})?

Answer and explanation

Correct answer: (4950)

(1225=S_{49}), so (2n=98) and (S_{98}=\frac{98\cdot99}{2}=4851). The correct option should be (B).

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Sequences Progressions Natural-Numbers Index Sum Of First N Natural Numbers Sequences And Progressions Mathematics Class 9 Mcq

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