甲,乙都抽到白球的機率 = 3/5 * 2/4 = 3/10甲,乙都抽到黑球的機率 = 2/5 * 1/4 = 1/10所以 甲,乙抽到相同顏色的球的機率 = 3/10 + 1/10 = 4/10 = 2/5甲,乙都抽到白球 然後丙抽到白球的機率 = 3/10 * 1/3 = 1/10甲,乙都抽到黑球 然後丙抽到白球的機率 = 1/10 * 3/3 = 1/10所以 甲,乙抽到相同顏色的球 然後丙抽到白球的機率 = 1/10 + 1/10 = 2/10 = 1/5條件機率 = (1/5) / (2/5) = 1/2
3.袋子裡有3顆白球, 2顆黑球。由甲、乙、丙三人依序各抽取1顆球,抽取後不放回..-阿摩線上測驗