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2.If 2 different representatives are to be selected at random from a group of 10 employees and if p is the probability that both representatives selected will be women, is p >1/2? (1)More than 1/2 of the 10 employees are women. (2)The probability that both representatives selected will be men is less than1/10
这个题的答案是什么啊??有说是B有说是E的,麻烦大家给我个解释和统一答案吧??
11.Mary persuaded n friends to donate $500 each to her election campaign, and then each of these n friends persuaded n more people to donate $500 each to Mary’s campaign.If no one donated more than once and if there were no other donations, what was the value of n? (1)The first n people donated 1/16 of the total amount donated. (2)The total amount donated was $120,000.
第一个条件肯定能推出来n值,可是第二个的确是能通过一个二次方程计算出来,但是n不是一个正整数,人数必须是正整数啊!!这样的话第二条件肯定是不行的啊!! 求牛人点拨,在线等!!! |
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