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Question

If P(AB)=0.8 and P(AB)=0.3 then P(¯¯¯¯A)+P(¯¯¯¯B)=?

A
0.3
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B
0.5
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C
0.7
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D
0.9
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Solution

The correct option is D 0.9
P(AB)=P(A)+P(B)P(AB)
P(A)+P(B)=0.8+0.3=1.1
And P(¯¯¯¯A)+P(¯¯¯¯B)=1P(A)+1P(B)=21.1=0.9

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