Question

A coin is tossed once. Find the probability of getting a head.

Answer 1

When a coin is tossed once, the sample space is given by $S=\{H,T\}$.

Let E be the event of getting a head.

Then, $E=\left\{H\right\}$

$\therefore n\left(E\right)=1$ and $n\left(S\right)=2$

$\Rightarrow$ P(getting a head) $=P\left(E\right)=\frac{n\left(E\right)}{n\left(S\right)}=\frac{1}{2}$