问题标题：
一个GRE数学题Ofthe700membersofacertainorganization,120arelawyers.Twomembersoftheorganizationwillbeselectedatrandom.Whichofthefollowingisclosettotheprobabilitythatneitherofthemembersselectedwillbealawyer?0.50.
问题描述：
一个GRE数学题
Ofthe700membersofacertainorganization,120arelawyers.Twomembersoftheorganizationwillbeselectedatrandom.Whichofthefollowingisclosettotheprobabilitythatneitherofthemembersselectedwillbealawyer?
0.50.60.70.80.9
孙先定回答：
题目意思明白吧?数学问题就是700选2,这2个不在120中,即剩下的580选2占700选2的概率：
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