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# Write down all the subsets of the following sets $\{a,b\}$

$\begin{array}{1 1}(A)\;\phi&(B)\;\{a\}\\(C)\;\{b\}&(D)\;\phi,\{a\},\{b\},\{a,b\}\end{array}$

All subsets of $\{a,b\}$ are $\phi,\{a\},\{b\},\{a,b\}$
Hence (D) is the correct answer.