Question 1171241
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*[tex \LARGE \ \ \ \ \ \ \ \ \ \ \frac{ {{5}\choose{4}} }{ {{25}\choose{4}} }]


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ \frac{ {{5}\choose{2}}\,\cdot\,{{20}\choose{2}} }{ {{25}\choose{4}} }]


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ \frac{ {{20}\choose{4}} }{ {{25}\choose{4}} }]


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ \frac{ {{5}\choose{1}}\,\cdot\,{{20}\choose{3}} }{ {{25}\choose{4}} }]


where *[tex \LARGE {{n}\choose{r}}\ =\ \frac{n!}{r!(n\,-\,r)!}]					

																
John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it
*[illustration darwinfish.jpg]

From <https://www.algebra.com/cgi-bin/upload-illustration.mpl> 
I > Ø
*[tex \Large \ \
*[tex \LARGE \ \ \ \ \ \ \ \ \ \  
								
{{n}\choose{r}}
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