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OpenStudy (anonymous):
infinite sum ? How can I get the sum of 1/4 (3/4)^n *n ?
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OpenStudy (anonymous):
\[\Sigma \frac{1}{4} (\frac{3}{4})^n n \] According to wolphram it is 12 but I don't know why?
OpenStudy (anonymous):
It is the sum from 0 to infinity
OpenStudy (primeralph):
How much calculus do you know?
OpenStudy (primeralph):
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