The sector of a circle with a 60 millimeters radius has a central angle measure of 30° . What is the exact area of the sector in
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Answer: The empty set { } which can be represented by the symbol 
Why is this the answer? Because there is nothing inside set M. Set M is itself the empty set. Intersecting the empty set with any other set leads to the empty set again.
Why is this the answer? Because there is nothing inside set M. Set M is itself the empty set. Intersecting the empty set with any other set leads to the empty set again.