If $A = \{1, 2, 3\}$, which is a proper subset of $A$?

If $A = \{1, 2, 3\}$, which is a proper subset of $A$?
  1. $\{1, 2\}$
  2. $\{1, 2, 3\}$
  3. $\{1, 2, 3, 4\}$
  4. $\{4\}$

Solution

Proper subset: $B \subsetneq A$ — $\{1,2\}$ has all its elements in $A$ but is strictly smaller.

Asked in: MH-SSC-9

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