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OpenStudy (anonymous):
\[C _{r} =\left(\begin{matrix}10 \\ 8\end{matrix}\right), then \sum_{r=1}^{10}\]\[r.C _{r}\over C _{r-1} \] is
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OpenStudy (anonymous):
are there suppose to be any variables in \[C _{r}\]
OpenStudy (zarkon):
Little \(\LaTeX\) tip... use {10 \choose 8} for \[{10 \choose 8}\]
OpenStudy (anonymous):
it is 50
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