5:5
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5:5 Drawing by proportion
5:5P(blue) = 5 / 10
5:5P(red) = 5 / 10
5:5 6:4
6:4 4:6
6:4??:?
5:5 Drawing by proportion &selection
5:5P(blue) =5(1+s) / 5(1+s) + 5
5:5P(red) =5 / 5(1+s) + 5
5:5 8:2
8:2 10:0