求一个概率题目 麻烦解释给出的写法为什么不对已知21点必须由 一张A和10,J,Q,K中的一张组成,那么 庄家和玩家都得到21点的概率是多大?方法1:[C(4,1)*C(16,1)*C(3,1)*C(15,1)] / [C(52,2) * C(51,2)] 方法2:[C(
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![求一个概率题目 麻烦解释给出的写法为什么不对已知21点必须由 一张A和10,J,Q,K中的一张组成,那么 庄家和玩家都得到21点的概率是多大?方法1:[C(4,1)*C(16,1)*C(3,1)*C(15,1)] / [C(52,2) * C(51,2)] 方法2:[C(](/uploads/image/z/4820883-51-3.jpg?t=%E6%B1%82%E4%B8%80%E4%B8%AA%E6%A6%82%E7%8E%87%E9%A2%98%E7%9B%AE+%E9%BA%BB%E7%83%A6%E8%A7%A3%E9%87%8A%E7%BB%99%E5%87%BA%E7%9A%84%E5%86%99%E6%B3%95%E4%B8%BA%E4%BB%80%E4%B9%88%E4%B8%8D%E5%AF%B9%E5%B7%B2%E7%9F%A521%E7%82%B9%E5%BF%85%E9%A1%BB%E7%94%B1+%E4%B8%80%E5%BC%A0A%E5%92%8C10%2CJ%2CQ%2CK%E4%B8%AD%E7%9A%84%E4%B8%80%E5%BC%A0%E7%BB%84%E6%88%90%2C%E9%82%A3%E4%B9%88+%E5%BA%84%E5%AE%B6%E5%92%8C%E7%8E%A9%E5%AE%B6%E9%83%BD%E5%BE%97%E5%88%B021%E7%82%B9%E7%9A%84%E6%A6%82%E7%8E%87%E6%98%AF%E5%A4%9A%E5%A4%A7%3F%E6%96%B9%E6%B3%951%3A%5BC%284%2C1%29%2AC%2816%2C1%29%2AC%283%2C1%29%2AC%2815%2C1%29%5D+%2F+%5BC%2852%2C2%29+%2A+C%2851%2C2%29%5D+%E6%96%B9%E6%B3%952%3A%5BC%28)
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