题目内容
（请给出正确答案）
[主观题]
（1) 盒子里装有3只黑球、2只红球、2只白球，在其中任取4只球，以X表示取到黑球的只数，以Y表示取到红球的只数．求
(1) 盒子里装有3只黑球、2只红球、2只白球，在其中任取4只球，以X表示取到黑球的只数，以Y表示取到红球的只数．求X和Y的联合分布律．
(2) 在(1)中求P{X＞Y}，P{Y=2X}，P{X+Y=3}，P{X＜3-Y}．
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