In a bag, red, green and blue marbles are there. The probability of getting a red marble is \begin{tabular}{|c|c|c|c|} \hline Color & Red & Green & Blue \\ \hline Number of marbles & 8 & 12 & 15 \\ \hline \end{tabular}
A box contains 3 green marbles, 5 red marbles and 2 blue marbles find the probability of getting a red marble.
A bag contains 4 red and 8 blue marbles. A marble is drawn at random. The probability of getting a red marble is 13.