If A and B be two arbitrary events, then

A

$$P(A \cap B)=P(A) P(B)$$

B

$$P(A \cup B)=P(A)+ P(B)$$

C

$$P(\frac{A}{B})= P(A \cap B)+P(B)$$

D

$$P(A \cup B) \leq P(A)+ P(B)$$