Question

In tossing three fair coins together what is the probability of getting all tails

Answer 1

In tossing three fair coins together, the sample space is given by:
$S=\{HHH,HHT,HTH,THH,HTT,THT,TTH,TTT\}$
$\therefore n\left(S\right)=8$
Let $A$ be the event of getting all tails
$A=\left\{TTT\right\}\therefore n\left(A\right)=1$
$\therefore P\left(A\right)=\frac{n\left(A\right)}{n\left(S\right)}=\frac{1}{8}$