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Question

Let A and B be two events such that P(A)=0.3 and P(AB)=0.8 if A and B are independent events, find 7P(B)

A
5
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B
4
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C
1
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D
3
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Solution

The correct option is A 5
As A and B are independent
0.8=P(AB)=P(A)+P(B)P(A)P(B)
=0.3+P(B)(0.3)P(B)
0.5=(0.7)P(B)
7P(B)=5.

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