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P(AnB)=P(A)+P(B)-P(AuB)
P(AnB)=2/3+1/2-5/6=4/6+3/6-5/6=2/6=1/3
2.
P(A)=1-P(A')
P(A)=1-0,5=0,5
P(B)=1-0,4=0,6
P(AnB)=0,5+0,6-0,7=0,4