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Let $$P$$ be the point $$(10, -2, -1)$$ and $$Q$$ be the foot of the perpendicular drawn from the point $$R(1, 7, 6)$$ on the line passing through the points $$(2, -5, 11)$$ and $$(-6, 7, -5)$$. Then the length of the line segment $$PQ$$ is equal to ________
Correct Answer: 13
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