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OpenStudy (anonymous):
How to calculate this sum in a faster way?
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OpenStudy (theviper):
???
OpenStudy (anonymous):
\[\sum_{10}^{i=1} ( 10Ci)\]
OpenStudy (experimentx):
2^10 - 1
OpenStudy (experimentx):
if it was \[ \sum_{i=1}^{10} \binom {10} i \]
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