Question

A dice is rolled once. Find the probability of getting the number $5$

Answer 1

In rolling a dice, the sample space $S=\{1,2,3,4,5,6\}\therefore n\left(S\right)=6$
Let $A$ be the event of getting the number $5$.
$A=\left\{5\right\}\Rightarrow n\left(A\right)=1$
$\therefore P\left(A\right)=\frac{n\left(A\right)}{n\left(S\right)}=\frac{1}{6}$