一道概率的计算题某人忘记了电话号码的最后一位,随意拨号.求他拨号不超过三次而接通所需要拨打电话的概率.若已经最后一个数字是奇数.那么此概率是多少.我第一问的P=0.1+0.9*0.1+0.9*0.8*0.1=
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![一道概率的计算题某人忘记了电话号码的最后一位,随意拨号.求他拨号不超过三次而接通所需要拨打电话的概率.若已经最后一个数字是奇数.那么此概率是多少.我第一问的P=0.1+0.9*0.1+0.9*0.8*0.1=](/uploads/image/z/3833522-26-2.jpg?t=%E4%B8%80%E9%81%93%E6%A6%82%E7%8E%87%E7%9A%84%E8%AE%A1%E7%AE%97%E9%A2%98%E6%9F%90%E4%BA%BA%E5%BF%98%E8%AE%B0%E4%BA%86%E7%94%B5%E8%AF%9D%E5%8F%B7%E7%A0%81%E7%9A%84%E6%9C%80%E5%90%8E%E4%B8%80%E4%BD%8D%2C%E9%9A%8F%E6%84%8F%E6%8B%A8%E5%8F%B7.%E6%B1%82%E4%BB%96%E6%8B%A8%E5%8F%B7%E4%B8%8D%E8%B6%85%E8%BF%87%E4%B8%89%E6%AC%A1%E8%80%8C%E6%8E%A5%E9%80%9A%E6%89%80%E9%9C%80%E8%A6%81%E6%8B%A8%E6%89%93%E7%94%B5%E8%AF%9D%E7%9A%84%E6%A6%82%E7%8E%87.%E8%8B%A5%E5%B7%B2%E7%BB%8F%E6%9C%80%E5%90%8E%E4%B8%80%E4%B8%AA%E6%95%B0%E5%AD%97%E6%98%AF%E5%A5%87%E6%95%B0.%E9%82%A3%E4%B9%88%E6%AD%A4%E6%A6%82%E7%8E%87%E6%98%AF%E5%A4%9A%E5%B0%91.%E6%88%91%E7%AC%AC%E4%B8%80%E9%97%AE%E7%9A%84P%3D0.1%2B0.9%2A0.1%2B0.9%2A0.8%2A0.1%3D)
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