急问几道机经！！！

miranda86

1、一个抽屉里有50条袜子,20条A色,20条B色,6条C色,4条D色,问连续无放回的取两条,有多少probability取到相同颜色的袜子.

2、某公司x产品比y产品profit多多少？ 两个条件是a) x的cost是y的98% b) x的price是y的105%  答案是不是E呢

3、60% people join a meeting are Republican , 50% of them are vegetarian. (1) 40% are both are both Republican and Vegetarian. (2) 30% in Republican are Vegetarian.          4、一个班级中，75% 为athlete, 44%为male，15% of the students are female who are not athlete.应该是求female athlete占多少。 “15% of the students are female who are not athlete”怎样用数学表示呢

myheart2008

1. 分子 C202+C202+C62+C42，分母C502，对吗？

2.我觉得是C啊，利润不是由成本和价格两个决定的？条件正好是2个