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

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For which (n) will the sum of the first (n) natural numbers exceed (3000) for the first time?

Answer and explanation

Correct answer: (77)

(S_{76}=2926) and (S_{77}=3003), so the sum first exceeds (3000) at (n=77). In boundary questions, check the two nearby 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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