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Beaver Grid Walk Counting

2050SpecialistCombinatoricsCounting Principles
A beaver walks from $(0,0)$ to $(4,4)$ in the plane, walking one unit in the positive $x$ direction or one unit in the positive $y$ direction at each step. Moreover, he never goes to a point $(x, y)$ with $y>x$. How many different paths can he walk?
0 students attempted0% solvedRating 2050

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