How do you find how many sets of four marbles include exactly two green marbles?

A bag contains a collection of distinguishable marbles. The bag has two red marbles, five green ones, one lavender one, five yellows, and five orange marbles. HINT [See Example 7.] How many sets of four marbles include exactly two green marbles? (Note that this means there must be two other non-green marbles as well). 3 X sets