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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 (20000)?

Answer and explanation

Correct answer: (200)

(S_{199}=19900) and (S_{200}=20100), so it first exceeds (20000) at (n=200). Checking nearby values is the safest method.

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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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