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The seeds of a garden pee are either yellow or green. A certain cross between pea plants produces progeny in t?

The seeds of a garden pee are either yellow or green. A certain cross between pea plants produces progeny in the ratio 3 yellow: 1 green. If four randomly chosen progeny of such a cross are examined, what is the probability that a) three are yellow and one is green? b) all four are yellow? c) all four are the same color?

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