A=biology, "P(A)=37\/45"
B=Physics, "P(B)=37\/45"
C=Math, "P(C)=20\/45"
a) "P(A+C)=P(A)+P(C)-P(AC)=\n\\frac{37}{45}+\\frac{20}{45}-\\frac{37}{45}\\cdot\\frac{20}{45}\\approx 0.9012"
b) "P(\\overline{ABC})=(1-P(A))(1-P(B))(1-P(C))=\\frac{8}{45}\\cdot \\frac{8}{45}\\cdot\\frac{25}{45}\\approx0.0176"
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