A) \[\frac{3}{7}\]
B) \[\frac{4}{7}\]
C) \[\frac{5}{7}\]
D) \[\frac{6}{7}\]
Correct Answer: C
Solution :
Since, \[P(A\cup B)=P(A)+P(B)-P(A)P(B)\] \[[\because \,P(A\cap B)=P(A)P(B)]\] \[\Rightarrow \]\[0.8=0.3+P(B)-0.3P(B)\] \[\Rightarrow \]\[0.7P(B)=0.5\Rightarrow P(B)=\frac{5}{7}\]You need to login to perform this action.
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