Question 1176350
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Since  P(A and B) = 0.5  and since  the events A and B are independent,


    P(A and B) = P(A)*P(B) = 0.3.


In the last equality, substitute  P(B) = 0.5.   You will get


    P(A)*0.5 = 0.3.


It implies  P(A) = {{{0.3/0.5}}} = 0.6.    <U>ANSWER</U>
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Solved.