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In the given figure, A B C is a righ...

In the given figure, `A B C` is a right-angled triangle with `B` as the right angle. Three semi-circles are drawn with `A B ,\ B C` and `A C` as diameters. What is the area of the shaded portion if the area of the triangle `A B C` is 12 square units? (FIGURE) (a) 6 square units (b) 12 square units (c) 24 square units (d) Cannot be determined as the data is insufficient

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