I need help with this question:
A bag contains $2$ red balls, $6$ blue balls and $7$ green balls. Victoria draws $2$ balls out of the bag. What is the probability that she gets a red ball and a blue ball?
I can figure out the probability of picking $1$ ball ($\frac{2}{15}$,$\frac{2}{5}$,$\frac{7}{15}$ respectively). But I am stuck a finding out the probability of 2.
Any help would be appreciated.