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Students at a certain school can check out instruments from the music department to practice. Let U be the set of instruments that are available to check out. Last week,

some of the instruments were checked out. Let M be the set of instruments checked out on Monday. Let T be the set of instruments checked out on Tuesday. Let W be the set of instruments checked out on Wednesday. Consider this set (which is written in descriptive form): The set of instruments checked out on both Tuesday and Wednesday, but not checked out on Monday (a) Which of these is a correct way to write the set? (b) Write the set in roster form.

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