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MathNet 2022-part-06 — 196 problems (EN–VI) Question 115

Math Olympiad Vault · MathNet 2022-part-06 — 196 problems (EN–VI)

Question 115

Consider the paths from $(0,0)$ to $(6,3)$ that only take steps of unit length up and right. Compute the sum of the areas bounded by the path, the $x$-axis, and the line $x=6$ over all such paths.
(In particular, the path from $(0,0)$ to $(6,0)$ to $(6,3)$ corresponds to an area of 0.)