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OpenStudy (anonymous):
Simplfy (n) - (n-1) (r) (r)
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OpenStudy (anonymous):
\[\left(\begin{matrix}n \\ r\end{matrix}\right) - \left(\begin{matrix}n-1 \\ r\end{matrix}\right)\]
OpenStudy (anonymous):
simplify
OpenStudy (welshfella):
|dw:1443370171228:dw|
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