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MathStackExchange
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13
Union of sets having $\binom{n - 1}{2}$ elements with each two of them having $n - 2$ common elements has cardinality of at least $\binom{n}{3}$.
9
$\{x^2\} = \{x\}^2$, how many solutions in interval $[1, 10]$
8
Number of points chosen form a polygon to have no isosceles and equilateral triangles.