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P(AuB)=P(A)+P(B)-P(AnB)
P(AnB)=3/4+1/3-11/12=9/12+4/12-11/12=2/12=1/6
P(A\B)=3/4-1/6=9/12-2/12=7/12
P(AnB)=P(A)+P(B)-P(AuB)
P(A\B)=P(A)-P(AnB)
P(AnB)=3/4+1/3-11/12=9/12+4/12-11/12= 2/12
P(A\B) = 3/4-2/12 = 7/12