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Take away 4 matchsticks to form 4 triangles. The triangles don't have to be equal in size.
The 4 triangles are:
2 triangles of size 1X1
1 triangle of size 2X2
1 triangle of size 3X3
There are also other solutions.
2 triangles of size 1X1
1 triangle of size 2X2
1 triangle of size 3X3
There are also other solutions.
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