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JEE Advance - Mathematics (1983 - No. 6)

The area of the triangle whose vertices are $$A(1, -1, 2), B(2, 1, -1), C(3, -1, 2)$$ is ..........
$$\sqrt{11}$$
$$\sqrt{12}$$
$$\sqrt{13}$$
$$\sqrt{14}$$
$$\sqrt{15}$$

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