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If (S_n=6216), what is the value of (n)?
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Answer and explanation
Correct answer: (111)
(S_{111}=\frac{111\times112}{2}=6216), so (n=111). Use (2S_n) to identify consecutive numbers.
Frequently asked questions
What is the correct answer to this question?
(111)
Why is this the correct answer?
(S_{111}=\frac{111\times112}{2}=6216), so (n=111). Use (2S_n) to identify consecutive numbers.
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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