Given that the events $A$ and $B$ are such that $P(A)=\frac{1}{2}, P(A \cup B)=\frac{3}{5}$ and $\mathrm{P}(\mathrm{B})=p .$ Find $p$ if they are mutually exclusive.
It is given that $P(A)=\frac{1}{2},\, P(A \cup B)=\frac{3}{5}$ and $P(B)=p$
When $A$ and $B$ are mutually exclusive, $A \cap B=\phi$
$\therefore P(A \cap B)=0$
It is known that, $P(A \cup B)=P(A)+P(B)-P(A \cap B)$
$\Rightarrow \frac{3}{5}=\frac{1}{2}+p-0$
$\Rightarrow p=\frac{3}{5}-\frac{1}{2}=\frac{1}{10}$
Three athlete $A, B$ and $C$ participate in a race competetion. The probability of winning $A$ and $B$ is twice of winning $C$. Then the probability that the race win by $A$ or $B$, is
Two events $A$ and $B$ will be independent, if
Let $A$ and $B$ be independent events with $P(A)=0.3$ and $P(B)=0.4$. Find $P(A \cap B)$
$A$ and $B$ are two events such that $P(A)=0.54$, $P(B)=0.69$ and $P(A \cap B)=0.35.$ Find $P \left( B \cap A ^{\prime}\right)$.
In a horse race the odds in favour of three horses are $1:2 , 1:3$ and $1:4$. The probability that one of the horse will win the race is