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Rioplatense Mathematical Olympiad, Level 3
2022 Rioplatense Mathematical Olympiad
1
Rioplatense 2022 - Level A - Problem 1
Rioplatense 2022 - Level A - Problem 1
Source:
December 6, 2022
combinatorics
Problem Statement
In the blackboard there are drawn
25
25
25
points as shown in the figure. Gastón must choose
4
4
4
points that are vertices of a square. In how many different ways can he make this choice?
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\begin{matrix}\bullet & \bullet & \bullet & \bullet & \bullet \\\bullet & \bullet & \bullet & \bullet & \bullet \\\bullet & \bullet & \bullet & \bullet & \bullet \\\bullet & \bullet & \bullet & \bullet & \bullet \\\bullet & \bullet & \bullet & \bullet & \bullet \end{matrix}
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