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OpenStudy (unklerhaukus):
\[4 \sum_{n=0}^{∞} {(-1)^{n-1} \over 2n-1}\]
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OpenStudy (anonymous):
http://www.wolframalpha.com/input/?i=sum+from+0+to+infinity+of+%28-1%29%5E%28n-1%29%2F%282n-1%29
OpenStudy (unklerhaukus):
what is n is from 1 to ∞ instead of 0 to ∞
OpenStudy (anonymous):
pi
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