Difference between subset & proper subset

Subset: If every element of 1st set is contained in the 2nd set, then the 1st set is called the subset of the 2nd set. For example: If A={2,3,5,6} and B={2,3,5,6} then A is the su...

A is subset of set B if every element of A is in B . Let B={1,2} then if A is subset of B then A can be phi, {1},{2},{1,2}...that means A set is subset of itself. But a proper subs...