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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 (10000)?

Answer and explanation

Correct answer: (141)

(S_{140}=9870) and (S_{141}=10011), so it first exceeds (10000) at (n=141). In boundary questions, check the previous and next sums.

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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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