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The length of the perpendicular from to the point (1, –2, 5) on the line passing through (1, 2, 4) and parallel to the line x + y – z = 0 x – 2y + 3z – 5 is

1. 2 21
2. 2 9
3. 2 73
4. 1

Correct answer: 2 21

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