Question 50
How many functions $f:\{1,2,3,4,5\} \rightarrow \{1,2,3,4,5\}$ have the property that $f(\{1,2,3\})$ and $f(f(\{1,2,3\}))$ are disjoint?
MathNet 2010 — Part 07 Question 50
Math Olympiad Vault · MathNet 2010 — Part 07
Math Olympiad Vault · MathNet 2010 — Part 07