Mathematics, 29.11.2020 18:30 unicornsflyhigh

Each of the four sets a1, a2, a3, and a4 contains four elements. the intersection of every i of these four sets (2 < i < 4) consisters of 5 - i elements. What is a1 U a2 U a3 U a4?

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Each of the four sets a1, a2, a3, and a4 contains four elements. the intersection of every i of thes...

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