Question

Suppose $A$ and $B$ are two events with $P(A)=0.5$ and $P(A\cup B)=0.8$. Let $P(B)=p$ if $A$ and $B$ are mutually exclusive and $P(B)=q$ if $A$ and $B$ are independent then

• A. $p=q$
• B. $p=2q$
• C. $2p=q$
• D. $p+q=1$

Answer 1

Answer: (C)

Correct answer is (c) $2p=q$