Answer
As given below
Work Step by Step
a) $P(A \cap B) = P(B) $
The union of A and B consists of those regions that is blue. If B lies within A, then the probability of $A \cap B$ and $B$ are the same.
b) $P(A\cup B) = P(B) $
$P(A \cup B)=P(A)+P(B) $
If A lies within B, then the probability of $A \cup B$ and $B$ are the same.
