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June 2016 p62 q7
2840
A team of 6 people is to be chosen from 5 swimmers, 7 athletes, and 4 cyclists. There must be at least 1 from each activity and there must be more athletes than cyclists. Find the number of different ways in which the team can be chosen.
Solution
We need to choose a team of 6 people with at least 1 swimmer, 1 athlete, and 1 cyclist, and more athletes than cyclists. Let's consider the possible distributions: