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Question
What universal set (s) would you propose for the following:
The set of isosceles triangles.
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Solution 1
The universal set for the set of isosceles triangles can be the set of triangles, polygons, or two-dimensional figures.
Solution 2
Isosceles triangle is a type of triangle. So the set of triangles contain all types of triangles.
∴ U = {x : x is a triangle in a plane)
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