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WHAT IS THE CARDINALITY OF {a,{a},{a,{a}}}

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The cardinality of any finite set is just the number of its elements. The elements of the set \{a,\{a\},\{a,\{a\}\}\} are:

  1. a
  2. \{a\}
  3. \{a,\{a\}\}

So the cardinality is |\{a,\{a\},\{a,\{a\}\}\}|=3.

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Question ID: mtid-5-stid-8-sqid-3642-qpid-2341