精确的是0.66.和第一个人相同的几率是6/30,和第二个人相同的几率是29/30*5/30,以次类推。。。
精确的是0.66.和第一个人相同的几率是6/30,和第二个人相同的几率是29/30*5/30,以次类推。。。
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