21 October 2016

457. Triangle 3X3: Remove 4 leaving 4 triangles

Easy Medium Hard Extreme

Take away 4 matchsticks to form 4 triangles. The triangles don't have to be equal in size.

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The 4 triangles are:

2 triangles of size 1X1
1 triangle of size 2X2
1 triangle of size 3X3

There are also other solutions.

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