Browse · MATH
Printjmc
counting and probability senior
Problem
An envelope contains eight bills: 2 ones, 2 fives, 2 tens, and 2 twenties. Two bills are drawn at random without replacement. What is the probability that their sum is \20$ or more?
Solution
There are ways to choose the bills. A sum of at least \20\ bills, one of the \20\ bills. Hence the probability is
Final answer
\frac{1}{2}