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The shortest distance between lines L 1 and L 2 , where L 1 : 2 4 z 3 1 y 2 1 x + = − + = − and L 2 is the line, passing through the points A(–4, 4, 3), B(–1, 6, 3) and perpendicular to the line 1 1 z 3 y 2 3 x − = = − − , is

1. 221 141
2. 117 24
3. 221 121
4. 117 42

Correct answer: 221 141

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