Difference between revisions of "1996 IMO Problems/Problem 1"

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[[Category:Olympiad Geometry Problems]]
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[[Category:3D Geometry Problems]]

Revision as of 15:33, 20 November 2023

Problem

We are given a positive integer $r$ and a rectangular board $ABCD$ with dimensions $|AB|=20$, $|BC|=12$. The rectangle is divided into a grid of $20 \times 12$ unit squares. The following moves are permitted on the board: one can move from one square to another only if the distance between the centers of the two squares is $\sqrt{r}$. The task is to find a sequence of moves leading from the square with $A$ as a vertex to the square with $B$ as a vertex.

(a) Show that the task cannot be done if $r$ is divisible by $2$ or $3$.

(b) Prove that the task is possible when $r=73$.

(c) Can the task be done when $r=97$?

Solution

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See Also

1996 IMO (Problems) • Resources
Preceded by
First Problem
1 2 3 4 5 6 Followed by
Problem 2
All IMO Problems and Solutions