Consider two events AAA and BBB. If P(A)=0.5P(A) = 0.5P(A)=0.5 and P(A∣B)=0.5P(A|B) = 0.5P(A∣B)=0.5, which of the following must be true?
A and B are mutually exclusive.
A and B are independent.
B is a subset of A.
P(B) must be 1.