Answer :
Given A and B are independent events =>
Since A and B are independent, A and are also independent
)
By theorem,
0.8= 0.3+(1-P(B))-0.3(1-P(B))
0.8= 0.3+1-P(B)-0.3+0.3P(B)
0.8-1= -0.7P(B)
-0.2= -0.7P(B)
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