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9. Write in the simplest possible form {x |x is a person who was present in today's class who is either younger than 5
9. Write in the simplest possible form {x |x is a person who was present in today's class who is either younger than 5 years old or older than 90 years old.}. 10. (a) Write a set for which 2 is not an element, but {2} is. (b) Explain why {0} is not empty. E
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