Two sets A and B have the property that there are precisely 144 sets which are subsets of either A or B or both. How many elements are in the union of A and B?Β
Source, problem 3
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Two sets A and B have the property that there are precisely 144 sets which are subsets of either A or B or both. How many elements are in the union of A and B?Β
Source, problem 3

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Slices of a simplex
If you cut a regular tetrahedron ABCD in half in between AB and CD (along the plane parallel to and equidistant from each), you get a square, like so:
Now take a 4-simplex (also known as a 5-cell), the 4-dimensional regular polytope with 5 equidistant vertices, and label the vertices ABCDE. What three-dimensional solid do you obtain by cutting along the hyperplane at the halfway point between AB and CDE?
This problem is from the 2018 Mathcamp Qualifying Quiz.
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