Ononot — Is the set S = \{1, 2, \{1, 2\}\} a subset of T = \{1, 2, \{

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Set Theorymedium

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Is the set $S = \{1, 2, \{1, 2\}\}$ a subset of $T = \{1, 2, \{1, 2\}, 3\}$ ?