14 May 2011

19. Triangle 3X3: Remove 3 leaving 7 triangles

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Remove 3 matchsticks leaving 7 triangles. All the triangles don't have to be the same size.

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There are:
3 triangles of size 1X1
3 triangles of size 2X2
1 triangle of size 3X3

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  1. It also can be that to remove the 3 sticks in the upper middle size triangle.