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Write down all the subsets of the following sets $\{1,2,3\}$

$\begin{array}{1 1}(A)\;\{\phi\},\{1\},\{2\}\\(B)\;\{\phi\},\{1\},\{2\},\{3\}\\(C)\;\{\phi\},\{1\},\{2\},\{3\},\{1,2\},\{1,3\},\{2,3\}\\(D)\;\{\phi\},\{1\},\{2\},\{3\},\{1,2\},\{1,3\},\{2,3\},\{1,2,3\}\end{array}$

$\{\phi\},\{1\},\{2\},\{3\},\{1,2\},\{1,3\},\{2,3\},\{1,2,3\}$
Hence (D) is the correct answer.