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MathNet 2021 — Part 05 Question 66

Math Olympiad Vault · MathNet 2021 — Part 05

Question 66

A set of 6 distinct lattice points is chosen uniformly at random from the set $\{1,2,3,4,5,6\}^2$. Let $A$ be the expected area of the convex hull of these 6 points. Estimate $N=\left\lfloor 10^4 A\right\rfloor$.

An estimate of $E$ will receive $\max \left(0,\left\lfloor 20-20\left(\frac{|E-N|}{10^4}\right)^{1 / 3}\right\rfloor\right)$ points.

Proposed by: Milan Haiman