标题: one confusing probability [打印本页] 作者: primefang 时间: 2002-7-28 15:51 标题: one confusing probability
there are two totally same sets,that is(1,2,3,4,5),then select one number from every set specifically,ask for the probability that the sum of the 2 numbers is less than 4?
please give me relatively detailed explanation! forgive me for writting English(have to),thanks!
I count as 3/25, some claim it should be 5/25,
why?作者: tongxun 时间: 2002-7-28 20:34
应该3/25。（1，2），（2，1）（1，1）。
选5/25。是因为没读懂less than 4。把1+3也算进去了。作者: primefang 时间: 2002-7-28 22:14
thanks a lot
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