Q37:
A box contains exactly 24 balls, of which 12 are red and 12 are blue. If two balls are to be picked from this box at random and without replacement, what is the probability that both balls will be red?
答案是 11/46
有没有知道什么做？ 谢谢谢谢谢谢作者: michellehoS 时间: 2011-5-25 20:31
C（12，2）/C(24,2)作者: Wangycbest 时间: 2011-5-27 06:39
第一次抽到红球几率1/2，因为不放回，第二次抽到几率11/23，两个相乘的
结果！作者: brendaqian 时间: 2011-5-27 21:30
谢谢谢谢谢谢 万分感谢
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