# <span lang="EN-US

We know that any set S such that every element of S is an element of the set A is said to be a subset of A.

Consider B = {1, 2, 3}, C = {1, 3} and D = {2, 3, 7}

It is clear from above that every element of the sets B, C and D is an element of set A, so, B, C and D are subsets of A.

Also, note that

Every set is a subset of itself, i. e. A A and

Empty set is a subset of every set, i. e. ϕ A.

So, A and ϕ are also subsets of A.

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