MathDB

The picture shows a triangle divided into

25

smaller triangles, numbered

1

25

. Is it possible to place the same numbers in the square cells 5

\times 5

so that any two numbers written in adjacent triangles were are also written in adjacent cells of the square? (The cells of a square are considered adjacent if they have a common side.) https://cdn.artofproblemsolving.com/attachments/4/3/758fe5531ab3e576ef4712c095b393f8dff397.png

9.4

Problems(1)