11 bills in all
The two bills must be 5,20 or 20,5
p = (2/11 * 4/10) + (4/11 * 2/10) = 8/55
Charlie's wallet contains 3 ones, 2 fives, 2 tens, and 4 twenty dollar bills. ?Charlie randomly grabs a bill from his wallet, replaces it, and grabs another bill. What is the probability that the sum of the two bills is $25? Maybe 6/25 or 6/110. I am confusing myself now and I really need help. The first time I came up with 8/121. I don't know anymore. Please help me
1 answer
1 answer