第一题，b题求详细解答步骤还有说明。
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so easy, 3 green balls of 10 balls, so every time the probability of green ball is 3/10, not green is 7/10. The outcomes of Y can only be 0 1 2 3
P{Y=0} = (7/10)^3 = .343
P{Y=1} = 3(3/10)*(7/10)^2 = .441
P{Y=2} = 3(3/10)^2*(7/10) = .181
P{Y=3} = (3/10)^3 = .027
P{Y=0} = (7/10)^3 = .343
P{Y=1} = 3(3/10)*(7/10)^2 = .441
P{Y=2} = 3(3/10)^2*(7/10) = .181
P{Y=3} = (3/10)^3 = .027
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