therefore, (34+40)/84 = 74/84 = 37/42...hence B
is there an easier way? I know that this has taken me lot longer than 2 minutes...
B. An easier way is to note that ANY yellow in a mixture will lead to Jaune, the wording is meant to slightly confuse you.
Thus, take the (combos possible for all three colors minus the combos possible for no yellow colors) divided by total possibilities will give you your answer.
9C3 - 5C3 = 84 - 20 = 64
64/84 = 37/42