In A Group Of 33 People At A Medical Clinic 11 Need Dental Work And 14 Need An E

In a group of 33 people at a medical clinic, 11 need dental work and 14 need an eye exam but do not need dental work. And 3 of the people need dental work but do not need an eye exam. How many need dental work and an eye exam? How many require neither dental work nor an eye exam?

 

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