A box contains four 40-W bulbs, five 60-W bulbs, and six 75-W bulbs. If bulbs are selected one by one in random order (without replacement), what is the probability that at least two bulbs must be selected to obtain one that is rated 75 W?

Im not really sure where to go with this problem, if someone could lead me in the right direction or offer a solution it would be greatly appreciated! Thanks!