甲乙两人各进行3次投篮甲每次投中的概率为三分之二,乙为四分之三

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  • (1)C(2,3)(2/3)²(1/3)=4/9

    (2)C(2,3)(3/4)²(1/4)+C(3,3)(3/4)³=27/32

    (3)C(3,3)(2/3)³×C(2,3)(3/4)²(1/4)+C(2,3)(2/3)²(1/3)×C(3,3)(3/4)³ =3/8