A jar contains 16 marbles, of which 4 are red, 3 are blue, and the rest are yellow.If 2 marbles are to be selected at random from the jar, one at a time without being replaced, what is the probability that the first marble selected will be red and the second marble selected will be blue?作者: shenyelaile 时间: 2011-8-20 06:11
肯定是不放回啊作者: Wangycbest 时间: 2011-8-22 06:16
当然是不放回啦
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