To determine if the set {d,h,k,n} is a subset of itself, we need to understand the definition of a subset. A set A is a subset of set B if every element of A is also an element of B. Since every set is a subset of itself, this statement is true.
Let A={d,h,k,n}. We need to determine if A⊆A.
According to the definition, a set A is a subset of set B if every element of A is also an element of B. In this case, since both sets are identical, every element in A is indeed in A.
Since A is a subset of itself, we conclude that the statement {d,h,k,n}⊆{d,h,k,n} is true.
True