In a paper box,there are 10 black and 7 green pens of brand X , and 9black and 12 green pens of brand Y. If six pens are taken at random from the box, find the probabilities of following events,
D) at least five pens of brand X are taken, given that half of he pens are black and another half of green.
probabilty
2010-05-22 5:09 am
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2010-05-22 5:58 am
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2010-05-21 21:59:06 補充：
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