If the probability for $A$ to fail in an examination is 0.2 and that for $B$ is 0.3 , then the proba

Question

If the probability for $A$ to fail in an examination is 0.2 and that for $B$ is 0.3 , then the probability in % that either $A$ or $B$ fails is

Professor PC Thomas Classes · Answer

False Given : $P(A)=0.2, P(B)=0.3$\ $P(A \cup B)=P(A)+P(B)-P(A) \cdot P(B)$\ (as $A, B$ are independent events)\ $=0.2+0.3-(0.2)(0.3)=0.44 
eq 0.5$.\