单项选择题


A square dart board has four dark circular regions of radius 3 inches，as shown in the design above．Each point on the dart board is equally likely to be hit by a dart that hits the board．What is the probability that a dart that hits the board will hit one of the circular regions（）

 

A.A
B.B
C.C
D.D
E.E

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单项选择题
Three red marbles and 2 white marbles are placed in an empty box．One marble at a time is to be selected randomly and removed from the box until all 5 marbles have been removed． What is the probability that each of the first 3 marbles removed will be red（）

A.A
B.B
C.C
D.D
E.E
单项选择题
If those employees who made 6 or more errors were removed from the sample and an employee were selected at random from those remaining，what is the probability that the employee selected made no errors（）

A.A
B.B
C.C
D.D
E.E
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