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

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At which (n) will (S_n) first become greater than (7000)?

Answer and explanation

Correct answer: (118)

(S_{117}=6903) and (S_{118}=7021), so it first exceeds (7000) at (n=118). In boundary questions, check two nearby values.

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

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