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5:5

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5:5

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5:5 Drawing by proportion

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5:5 P(blue) = 5 / 10

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5:5 P(red) = 5 / 10

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5:5 6:4

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6:4 4:6

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6:4 ? ?:?

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5:5 Drawing by proportion & selection

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5:5 P(blue) = 5(1+s) / 5(1+s) + 5

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5:5 P(red) = 5 / 5(1+s) + 5

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5:5 8:2

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8:2 10:0