A box contains only red chips, white chips, and blue chips. If a chip is randomly selected from the box,what is the probability that the chip will be either white or blue?
(1) The probability that the chip will be blue is
1/5.
(2) The probability that the chip will be red is
1/3作者: chanyeen 时间: 2012-8-3 17:09
答案是选B，请大牛帮我解释一下作者: she9527 时间: 2012-8-3 17:10
1-1/3作者: kevinsee 时间: 2012-8-3 17:20
等于说除了条件2里面的情况，都是符合题目的可能，条件1推不出来
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