Problem1. Three identical wallets each contain two bills. One contains two $20 bills, another contains two $5 bills, and the third contains one $5 and one $10 bill. One of these three wallets is randomly selected and a randomly chosen bill is removed. If the bill is found to be a $20, What is the probability that the remaining bill is also a $20? Solution Only one wallet contains $20 bills and in this particular wallet, both bills are $20. Given that the first bill was found to be $20, the probability that the second bill is $20 is equal to 100%..