Answer
a) $0.2$ b)$0.3$
Work Step by Step
a) $P(A\cap B)=P(A|B)P(B)=0.4\cdot0.5=0.2$
a) $P(A'\cap B)=P(A'|B)P(B)=(1-0.4)\cdot0.5=0.3$
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