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Online ProgramB is a \(\textbf{subset} \) of a set A if every element of B is an element of A. For example, if \(A=\{a,b\}\), then all the subsets of A are \(\emptyset , \{a\}, \{b\}, \) and A (here\( \emptyset\) is the \(\textbf{emptyset},\) the unique set consisting of no elements). How many subsets does the set \(\{1,\ 2,\dots ,n\}\) have, where n is a positive integer?