An automated teller machine at a local bank is stocked with $10 and $20 bills. When a

Question:

An automated teller machine at a local bank is stocked with $10 and $20 bills. When a customer withdraws $40 from the machine, it dispenses either two $20 bills or four $10 bills. If two customers withdraw $40 each, how many outcomes are possible? Show all these outcomes in a Venn diagram, and draw a tree diagram for this experiment.