Question

A dice is rolled once. Find the probability of getting an odd number

Answer 1

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