Question

Given, $P\left(A\right)=\frac{3}{5}$ and $P\left(B\right)=\frac{1}{5}$. Find $P\left(AorB\right)$, if A and B are mutually exclusive events.

Answer 1

Here, $P\left(A\right)=\frac{3}{5}$ and $P\left(B\right)=\frac{1}{5}$

For mutually exclusive events A and B,

$P\left(AorB\right)=P\left(A\right)+P\left(B\right)$

$P\left(AorB\right)=\frac{3}{5}+\frac{1}{5}=\frac{4}{5}$