Consider the Venn Diagram above for the following scenario:
7000 sports fans in Cincinnati were surveyed
3827 liked the reds
4623 liked the bengals
2189 liked the cyclones
3246 liked the reds and the bengals
467 liked the reds and the cyclones
993 liked the bengals and the cyclones
239 liked all three

(make sure to use the inclusion-exclusion principle)