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Question

If A and B are two events, the probability that exactly one of them occurs is given by

A
P(A)+P(B)2P(AB)
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B
P(AB)+2P(¯AB)
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C
P(AB)P(AB)
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D
P(¯A)+P(¯B)2P(¯A¯B)
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Solution

The correct options are
A P(A)+P(B)2P(AB)
B P(AB)+2P(¯AB)
C P(AB)P(AB)
D P(¯A)+P(¯B)2P(¯A¯B)
Exactly one of the events of E
A and B is represented by A¯¯¯¯B+¯¯¯¯AB
hence P(A¯¯¯¯B)+P(¯¯¯¯AB)={P(A)P(AB)}+{P(B)P(AB)} =P(A)+P(B)2P(AB)
which is option (A).
P(A¯¯¯¯B)+P(¯¯¯¯AB)=[P(A)+P(B)P(AB)]P(AB)=P(AB)P(AB)
which is option (C).
P(A¯¯¯¯B)+P(¯¯¯¯AB)=1P(¯¯¯¯A)+1P(¯¯¯¯B)2{1P(¯¯¯¯A¯¯¯¯B)}=2P(¯¯¯¯A¯¯¯¯B)P(¯¯¯¯A)P(¯¯¯¯B)={2P(¯¯¯¯A)+2P(¯¯¯¯B)2P(¯¯¯¯A¯¯¯¯B)}P(¯¯¯¯A)P(¯¯¯¯B)=P(¯¯¯¯A)+P(¯¯¯¯B)2P(¯¯¯¯A¯¯¯¯B)
which is option (D).
and P(A¯¯¯¯B)+P(¯¯¯¯AB)=1P(¯¯¯¯AB)+P(¯¯¯¯AB)¯¯¯¯¯¯¯¯¯¯¯¯¯A¯¯¯¯B=¯¯¯¯AB
by demorgan's law P(A¯¯¯¯B)=1P(¯¯¯¯AB)P(A¯¯¯¯B)+P(¯¯¯¯AB)={1P(¯¯¯¯A)P(B)+P(¯¯¯¯AB)}+P(¯¯¯¯AB)=P(A)P(B)+2P(¯¯¯¯AB)

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