Question

If two coins are tossed, then find the probability of the event that at least one tail turns up.

Answer 1

Let $S$ be the sample. Two coins are tossed
$S=\{HH,HT,TH,TT\}$
$\therefore n\left(S\right)=4$
Let $A$ be the event of getting atleast one tail
$A=\{HT,TH,TT\}$
$\therefore n\left(A\right)=3$
$P\left(A\right)=\frac{n\left(A\right)}{n\left(S\right)}=\frac{3}{4}$