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OpenStudy (anonymous):
Reflect on Q on link!
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OpenStudy (mertsj):
What is the previous example?
OpenStudy (mertsj):
I don't know how to verify that the formula is correct without deriving it. It is the formula for the sum of n terms of an arithmetic series that's all.
OpenStudy (mertsj):
\[\S _{n}=\frac{10}{2}[2(0)+(10-1)(1)]=5[9]=45\]
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