If P(A∣B)=P(B∣A)P(A|B) = P(B|A)P(A∣B)=P(B∣A), which of the following must be true?
P(A)=P(B)P(A) = P(B)P(A)=P(B)
AAA and BBB are independent
P(A∩B)=P(A)P(B)P(A \cap B) = P(A)P(B)P(A∩B)=P(A)P(B)
Both a and b