A fractal triangle

The figure above is Sierpinski triangle, It turns out the moment of inertia can be calculated. If the moment of inertial through its center and perpendicular to the plane can be written as ABMl2\frac { A }{ B } M{ l }^{ 2 }. What is the value of A+BA+B, where ll is the side length and AA and BB are co-prime positive integers?

Not an original problem

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