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4 The line  1 passes through the point (2, 6, 2) and is perpendicular to the plane 2 x + y – 2 z = 10. Then the shortest distance between the line  1 and the line 2 z 3 4 y 2 1 x      is

1. 3 19
2. 3 13
3. 9
4. 7

Correct answer: 9

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