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If (S_n-S_{n-1}=84), what will be (S_{n-1})?
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Answer and explanation
Correct answer: (3486)
(S_n-S_{n-1}=n), so (n=84) and (S_{83}=\frac{83\cdot84}{2}=3486). For the previous sum, take (n-1).
Frequently asked questions
What is the correct answer to this question?
(3486)
Why is this the correct answer?
(S_n-S_{n-1}=n), so (n=84) and (S_{83}=\frac{83\cdot84}{2}=3486). For the previous sum, take (n-1).
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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