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a)
P(A)=1-0,25=0,75
P(AnB)=P(A)+P(B)-P(AuB)
P(AnB)=0,75+0,6-0,9=0,45
P(A/B)=0,45/0,6=0,75
b)
P(B)=1-0,7=0,3
P(AnB)=0,3+0,3-8/15=9/30+9/30-16/30=2/30=1/15
P(A/B)=1/15 : 0,3=1/15*10/3=2/9