Is it a Subset?

A={6,2,4,1,5}A = \{6,2,4,1,5\}.

Which of the options below is not a proper subset of AA?

  • {2}\{2\}
  • {1,2,3}\{1,2,3\}
  • {6,5,2,1}\{6,5,2,1\}
  • {1,2,4,5}\{1,2,4,5\}
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