Let $X=\{1,2,3,\ldots,10\}$. Find the number of pairs $\{A,B\}$ Such that $A,B\subseteq X$, $A\neq B$ and $A \cap B=\{5,7,8\}$.
Not a homework question. It is a question from a Math olympiad.
Let $X=\{1,2,3,\ldots,10\}$. Find the number of pairs $\{A,B\}$ Such that $A,B\subseteq X$, $A\neq B$ and $A \cap B=\{5,7,8\}$.
Not a homework question. It is a question from a Math olympiad.