If a committee of 3 people is to be selected from among 5 married couples so that the committee does not include two people who are married to each other, how many such committees are possible?
A.20
B.40
C.50
D.80
E 120
Of the families in City X in 1994, 40 percent owned a personal computer.The number of families in City X owning a computer in 1998 was 30 percent greater than it was in 1994, and the total number of families in City X was 4 percent greater in 1998 than it was in 1994.What percent of the families in City X owned a personal computer in 1998?
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发表于 2008-3-19 00:13:00
