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Mathematics 17 Online
OpenStudy (anonymous):

If the nth term of a sequence is 2n + 4, what is the sum of the first n terms?

OpenStudy (freckles):

hints: \[\sum_{i=1}^{n}i=\frac{n(n+1)}{2} \\ \text{ and } \sum_{i=1}^{n}c=cn\]

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