Events XXX and YYY have P(X)=0.5P(X) = 0.5P(X)=0.5, P(Y)=0.4P(Y) = 0.4P(Y)=0.4, and P(X∪Y)=0.7P(X \cup Y) = 0.7P(X∪Y)=0.7. What is P(X∣Y)P(X|Y)P(X∣Y)?
0.5
0.2/0.4
0.2/0.5
0.3/0.4