There are two boxes containing only green and red pens. Box A has 12 green pens and 4 red pens.
Box B has 7 green pens and 13 red pens.
A pen is randomly chosen from each box.
List these events from least likely to most likely.
Event 1: choosing a green or red pen from Box B.
Event 2: choosing a blue pen from Box A.
Event 3: choosing a red pen from Box B.
Event 4: choosing a green pen from Box A.