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can someone help me figure it out? thanks! sorry, there is no ping yin shu ru in my new computer.
Six cards numbered from 1 to 6 are placed in an empty bowl. First one card is drawn and then put back into the bowl; then a second card is drawn. If the cards are drawn at random and if the sum of the numbers on the cards is 8, what is the probability that one of the two cards drawn is numbered 5 ?
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发表于 2009-12-4 11:57:38
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