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The value of (S_n-S_{n-2}+S_{n-6}-S_{n-8}) is (312). What is (n)?
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Answer and explanation
Correct answer: (80)
The expression is ((n-1)+n+(n-7)+(n-6)=4n-14), and (4n-14=312) gives no integer (n). Convert into terms and check parity first.
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What is the correct answer to this question?
(80)
Why is this the correct answer?
The expression is ((n-1)+n+(n-7)+(n-6)=4n-14), and (4n-14=312) gives no integer (n). Convert into terms and check parity first.
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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