If $A \subseteq B$ and $B \subseteq A$, then

If $A \subseteq B$ and $B \subseteq A$, then
  1. $A = B$
  2. $A \cap B = \emptyset$
  3. $A$ and $B$ are disjoint
  4. $A \subset B$

Solution

Mutual inclusion implies equality.

Asked in: MH-SSC-9

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