Define subset of a set. – InterviewSolution

1.

Define subset of a set.

Answer»

A set A is said to be subset of set B if every element of A is also an element of B, and we write, A ⊆ B

If A ⊆ B then B is called a superset of A, and we write, B ⊇ A
If A ⊆ B and A ≠ B then A is called a proper subset of B.
If there exists even a single element in A which is not in B, then A is not a subset of B and we write, A⊄B
Every set A is a subset of itself
Empty set φ is a subset of every set.

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