Question 1124606
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You may consider A and B as the subsets of the universal set U.



Then  (A &#8745; B') = A \ (A &#8745; B).       ( Elements of A that are not in B ) 

                                     The sign " \ " means subtraction of sets )


Therefore, you need first to find  P(A &#8745; B)  and  then subtract it from P(A).



    Step 1.   P((A &#8745; B) = P(A) + P(B) - P(AUB) = {{{1/3}}} + {{{1/4}}} - {{{1/2}}} = {{{(4+3-6)/12}}} = {{{1/12}}}.


    Step 2.   P(A &#8745; B') = P(A \ (A &#8745; B)) = P(A) - P((A &#8745; B) = {{{1/3}}} - {{{1/12}}} = {{{4/12}}} - {{{1/12}}} = {{{3/12}}} = {{{1/4}}}.


<U>Answer</U>.  P(A &#8745; B') = {{{1/4}}}
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Solved.