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
How many students are either juniors or males or both
A. 678
B. 766
C. 948
D. 1,130
E. 1,312
单项选择题
If a and b are the lengths of the legs of a right triangle whose hypotenuse is 10 and whose area is 20,what is the value of (a +b.2
A. 100
B. 120
C. 140
D.180
E.200
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