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单选题
In a survey of 63 people, 23 people subscribed to magazine A, 21 people subscribed to magazine B, and 17 subscribed to magazine C. For any two of the magazines, 4 people subscribed to both magazines but not to the third magazine. If 18 people in the survey did not subscribe to any of the three magazines, how many people subscribed to all three magazines?
A
9
B
7
C
5
D
2
E
It cannot be determined from the information given.
参考答案
参考解析
解析：
To count the number of elements in set A or B or C, find the sum of the members of each set, subtract from this sum the sum of the elements common to any two of these sets, and then subtract twice of the number of elements common to all three sets. If x represents the number of people who subscribe to all three magazines, the number of people who subscribe to magazine A or B or C is 23+21+17-(4+4+4)-2x or 49-2x Since 18 of the 63 people did not subscribe to any of the three magazines, 45 people subscribed to magazine A or B or C. Hence, 45 = 49-2x, so x = 2.
To count the number of elements in set A or B or C, find the sum of the members of each set, subtract from this sum the sum of the elements common to any two of these sets, and then subtract twice of the number of elements common to all three sets. If x represents the number of people who subscribe to all three magazines, the number of people who subscribe to magazine A or B or C is 23+21+17-(4+4+4)-2x or 49-2x Since 18 of the 63 people did not subscribe to any of the three magazines, 45 people subscribed to magazine A or B or C. Hence, 45 = 49-2x, so x = 2.
更多 “单选题In a survey of 63 people, 23 people subscribed to magazine A, 21 people subscribed to magazine B, and 17 subscribed to magazine C. For any two of the magazines, 4 people subscribed to both magazines but not to the third magazine. If 18 people in the survey did not subscribe to any of the three magazines, how many people subscribed to all three magazines?A 9B 7C 5D 2E It cannot be determined from the information given.” 相关考题
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共用题干
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资料：In a survey,people were asked to choose between treatments to save 600 people from dying a disease.
Participants,including physicians,were asked to choose between a certain outcome that 200 people will be saved and a risky choice where there is a one-third probability that 600 people will be saved and a two-thirds probability that no people will be saved.
In a second example,the group were asked to choose between allowing 400 people to die or a one-third probably that nobody will die and two-thirds probability that 600 people will die.
In both examples,the first choices have an identical outcome as do their second alternatives.But faced with such a grave choice people did not spot the similarities. In the first example people opted to save 200 people over the gamble of losing people and in the second example people preferred the gamble over the certain outcome of killing 400 people.
What the experiment shows is that wording can have potentially dangerous consequences.Most of people tend to feel losses much more strongly than the pleasure of making a comparable gain.
In the second example，more people choose the option（ ）？
A.with a one-third probability that nobody will die
B.with a two-thirds probability that nobody will be saved
C.allowing 400 people to die
D.that 200 people will be saved
考题
资料：In a survey,people were asked to choose between treatments to save 600 people from dying a disease.
Participants,including physicians,were asked to choose between a certain outcome that 200 people will be saved and a risky choice where there is a one-third probability that 600 people will be saved and a two-thirds probability that no people will be saved.
In a second example,the group were asked to choose between allowing 400 people to die or a one-third probably that nobody will die and two-thirds probability that 600 people will die.
In both examples,the first choices have an identical outcome as do their second alternatives.But faced with such a grave choice people did not spot the similarities. In the first example people opted to save 200 people over the gamble of losing people and in the second example people preferred the gamble over the certain outcome of killing 400 people.
What the experiment shows is that wording can have potentially dangerous consequences.Most of people tend to feel losses much more strongly than the pleasure of making a comparable gain.
What is the difference between the two examples mentioned in the passage？A.The participants
B.The wording
C.The background
D.The contents
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50% of the people（）for the survey were female.Awere questionedBwho questionedCwho were questionedDquestion
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50% of the people（）for the survey were female.AquestionBwho questionedCwere questionedDwho werequestioned
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This sign warns（）ahead.A、people the dangerB、people of the dangerC、people about the dangerD、the danger
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单选题Some people are often surprised by what other people do. According to Berger, that is mainly because _____.A
some people are more emotional than othersB
some people are not aware of the fact that we will never completely know another personC
some people are sensitive enough to sense the change of other people’s attitudesD
some people choose to keep to themselves
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单选题That happiness knows no gender was borne _____ by a worldwide survey of almost 170, 000 people, conducted in the 1980s and reported by Ronald Inglehart of the University of Michigan.A
in onB
outC
down uponD
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SimileB
Transferred epithetC
MetonymyD
Repetition
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helps people realize their goalsB
makes people forget their setbacksC
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单选题Just over 70% of people（）for the survey said the net had become essential.A
questioningB
questionedC
questionD
to question
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were questionedB
who questionedC
who were questionedD
question
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questionB
who questionedC
were questionedD
who werequestioned
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for leading people toB
to lead people toC
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for leading people into
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keep people warmB
provide people with protectionC
make people beautifulD
build up people’s confidence
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单选题The underlined word “assemble” in the second paragraph probably means ______.A
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