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Is it a Subset?

Discrete Mathematics Level 1

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

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

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

\[\{1,2,3\}\] \[\{2\}\] \[\{6,5,2,1\}\] \[\{1,2,4,5\}\]

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by Karleigh Moore

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