单项选择题

In a group of 80 students, 24 are enrolled in geometry, 40 in biology, and 20 in both. If a student were randomly selected from the 80 students, what is the probability that the student selected would not be enrolled in either course

A. 0.20
B. 0.25
C. 0.45
D. 0.55
E. 0.60
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单项选择题
If (7,3) is the center of the circle above, then the radius of the circle could be equal to which of the following（）

A. 2
B. 3
C. 5
D. 7
E. 9
单项选择题
A political poll showed that 80 percent of those polled said they would vote for proposition P. Of those who said they would vote for proposition P, 70 percent actually voted for P, and of those who did not say they would vote for P, 20 percent actually voted for P. What percent of those polled voted for P
A. 56%
B. 60%
C. 64%
D. 76%
E. 90%
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