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No, a set of days with names containing the letter "x" is not a formal mathematical set unless explicitly defined as such. In mathematics, a set is a well-defined collection of distinct objects, and days of the week do not typically fall under this definition. However, if you were to create a set of days with names containing the letter "x," it would include "Wednesday" and "Friday."

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Wiki User

9y ago

The empty set, if you are referring to names of days of the week.

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Wiki User

9y ago

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an empty set

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Q: Is a set of days with names containing x?
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