Question 7
A box is described as containing “4 balls” labelled 1, 4, 7, 10, 13. Dũng draws two balls without looking. How many different sums of the two labels can he obtain?
Clarifying assumption: the stated count conflicts with the five listed labels. For this exercise, use one ball for each listed label, so there are five balls.
Clarifying assumption: the stated count conflicts with the five listed labels. For this exercise, use one ball for each listed label, so there are five balls.