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

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If (S_n=7626), what is the value of (S_{n+2})?

Answer and explanation

Correct answer: (7875)

(7626=S_{123}), so (S_{125}=\frac{125\cdot126}{2}=7875). First identify (n) and then move (2) ahead.

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

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