GCSE Maths Practice: tree-diagrams

\( \begin{array}{l}\text{A bag contains 3 red balls, 4 green balls, and 5 blue balls.}\\\text{One ball is drawn, and then a second ball is drawn without replacement.}\\\text{What is the probability of drawing a green ball first and a red ball second?}\end{array} \)

Choose one option:

\( \frac{2}{15} \) \( \frac{12}{132} \) \( \frac{6}{72} \)