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1。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 of 1/16 the total amount donated.
(2)The total amount donated was $120,000.
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 1/2of the 10 employees are women.
(2)The probability that both representatives selected will be men is less than 1/10. |
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发表于 2010-2-17 13:28:29
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