A bag has 5 red marbles, 4 green marbles and 3 blue marbles. All marbles are identical in all respects other than colour. A marble is taken out from the bag without looking into it. What is the probability that it is a non-green marble?
1
\(\frac{7}{12}\)
2
\(\frac{5}{12}\)
3
\(\frac{1}{3}\)
4
\(\frac{2}{3}\)