Question 1122896
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The experiment has four mutually exclusive outcomes. So....<br>
first question: what is Pr({c})?<br>
Pr({c}) = Pr({b,c}) - Pr({b}); Pr({b}) = 1 - Pr({a,c,d})<br>
second question: what is Pr({a,d)})?<br>
Pr({a,d}) = Pr({a,c,d}) - Pr({c})<br>
You can do the arithmetic.