โจทย์เรื่องเซต
A nutritionist at a school is planning a schedule of breakfasts for 175
students. 73 students say they want milk, 97 want juice, and 60 want fruit.
19 say they want both milk and fruit; of these 11 want juice as well. 34 want
only milk and 36 want only fruit.
How many students want juice only?