Question

I want some knowledge about subsets.
please friends I need it urgently!

Answer 1

n mathematics, especially in set theory, a set A is a subsetof a set B, or equivalently B is a superset of A, if A is "contained" inside B, that is, all elements of A are also elements of B. A and B may coincide. The relationship of one set being a subset of another is called inclusion or sometimes containment.