There are two bags containing only purple and yellow marbles.

bag a has 6 purple marbles and 4 yellow marbles.
bag b has 7 purple marbles and 13 yellow marbles.

a marble is randomly chosen from each bag. list these events from least likely to most likely.
event 1 : choosing a purple or yellow marble from bag b.
event 2 : choosing a purple marble from bag b.
event 3 : choosing a purple marble from bag a.
event 4 : choosing an orange marble from bag a.