Question

Two coins are tossed simultaneously. Write the sample space $S$ and the number of sample point $n\left(S\right)$. $A$ is the event of getting at least one head. Write the event $A$ in set notation and find $n\left(A\right)$

Answer 1

Sample space $S=\left\{\right(H,H),(H,T),(T,H),(T,T\left)\right\}$
Number of sample space $n\left(S\right)=4$
$A=$ Getting at least one head
$A=\left\{\right(H,H),(H,T),(T,H\left)\right\}$
$n\left(A\right)=3$