Is it a Subset?

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

Which of the options below is not a proper subset of \(A\)?

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