1. What is the definition of the U3? 2. What is the definition of the U5? 3. What is the definition of the U6? 4. What is the difference between the U6 and the official rate of unemployment in October 2009? (percentage) 5. What is the difference between the U5 and the official rate of unemployment in October 2009? (percentage) _ U-6 Unemployment Rate _ U-5 Unemployment Rate _- Official Unemployment Rate.