Feeling a bit rusty on my probability - Say you have 70,000,000 people in a country and a small town with 13,700 people. Now, say 3,000 - 5,000 people of the 70,000,000 people become infected with cancer per year. What are the chances 5 people from the small town get infected in one year? This isn't for a class so I welcome the right answer. I was thinking something along the lines of (3,000/70,000,000 * 13,700/70,000,000)^5 percent chance to(5,000/70,000,000 * 13,700/70,000,000)^5 percent chance, but I'm can't recall at the moment.