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What is the explicit rule of the sequence (1,3,6,10,15,\ldots)?
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Answer and explanation
Correct answer: (a_n=\frac{n(n+1)}{2})
These are triangular numbers and the rule is (a_n=\frac{n(n+1)}{2}). Recognize the pattern of adding (1,2,3,4).
Frequently asked questions
What is the correct answer to this question?
(a_n=\frac{n(n+1)}{2})
Why is this the correct answer?
These are triangular numbers and the rule is (a_n=\frac{n(n+1)}{2}). Recognize the pattern of adding (1,2,3,4).
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Sequences and Progressions. Topic: Explicit or general rule.
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