Consider the experiment of throwing a die, if a multiple of 3 comes up, throw the die again and if any other number comes, toss a coin. Find the conditional probability of the event - the coin shows a tail, given that - at least one die shows a 3.

Question

$\begin{array}{1 1} 0 \\ \frac{3}{20} \\ \frac{1}{4} \\ \frac{1}{10} \end{array} $