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At which (n) will (S_n) first become greater than (15000)?
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Answer and explanation
Correct answer: (173)
(S_{172}=14878) and (S_{173}=15051), so it first exceeds (15000) at (n=173). In boundary questions, check the previous and next sums.
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What is the correct answer to this question?
(173)
Why is this the correct answer?
(S_{172}=14878) and (S_{173}=15051), so it first exceeds (15000) at (n=173). In boundary questions, check the previous and next sums.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Sequences and Progressions. Topic: Sum of first n natural numbers.
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