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It is the set of all elements we are considering or dealing with in a given problem. We use a capital U or sometimes capital E to mean the universal set.

Now take ANY two sets, A and B. If every single element of set A is contained in set B, we say A is a subset of B.

The empty set is a subset of every set.

Every set in contained in the universal set, so they are all subset of it.

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Q: What the universal set and a subset?
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