Ononot — Consider the set S = \{1, 2, \{1, 2\}, 3\}. How many element

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Set Theorymedium

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Consider the set $S = \{1, 2, \{1, 2\}, 3\}$ . How many elements of the power set $\mathcal{P}(S)$ are themselves subsets of $\{1, 2, 3\}$ ?