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If (S_n+S_{n-1}=1561) and (S_n-S_{n-1}=40), which is the value of (S_n)?
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Answer and explanation
Correct answer: (800.5)
Adding the two equations gives (2S_n=1601), so (S_n=800.5). If an integer is not obtained, check the consistency of given values.
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What is the correct answer to this question?
(800.5)
Why is this the correct answer?
Adding the two equations gives (2S_n=1601), so (S_n=800.5). If an integer is not obtained, check the consistency of given values.
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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