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It isn't. The empty set is a subset - but not a proper subset - of the empty set.
A set with n elements has 2n subsets. The number of proper subsets is one less, since 2n includes the set itself.
if A element exis in set B thiscalled proper sub set
Because every set is a subset of itself. A proper subset cannot, however, be a proper subset of itself.
how do i list 0,1,123,4,34 i proper set notations? and then place the elements in numerical order.