Question 1129430
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1.  I read  (C1 U C2)C3  as  ((C1 U C2) intersection C3).


    Then, since the subsets  C1, C2 and C3 are mutually disjoint, the subset  (C1 U C2)C3  is empty.

    Therefore  P((C1 U C2)C3) = 0.      <U>ANSWER</U>



2.  Since the subsets  C1  and  C2  are disjoint,  P(C1 U C2) = P(C1) + P(C2).     <U>ANSWER</U>
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Solved.