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Question

Let A and B be two events such that P(A)=0.3,P(AB)=0.8. If A and B are independent events, then P(B) is equal to

A
57
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B
23
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C
1
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D
None of these
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Solution

The correct option is C 57
Since A and B are independent events.
P(AB)=P(A)+P(B)P(A).P(B)
0.8=0.3+P(B)0.3P(B)
0.5=P(B)(10.3)
0.50.7=P(B)
P(B)=57

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