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Mathematics 7 Online
OpenStudy (anonymous):

7 tvs 4 are defective what is the probability that 2 randomly chosen tv's work

OpenStudy (amoodarya):

\[p=\frac{ \left(\begin{matrix}3 \\ 2\end{matrix}\right) }{ \left(\begin{matrix}7 \\ 2\end{matrix}\right) }\]

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