Question 2
Nine balls are labelled 1 through 9. An, Bình, Châu and Dũng each take two balls in that order. An’s two labels sum to 10; Bình’s labels differ by 1; Châu’s labels have product 24; and the quotient of Dũng’s larger label by his smaller label is 3. What is the label of the remaining ball? Explain your reasoning.
