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The line L 1 is parallel to the vector → a = − 3 i ˆ + 2 j ˆ + 4 k ˆ and passes through the point (7, 6, 2) and the line L 2 is parallel to the vector → b = 2 i ˆ + j ˆ + 3 k ˆ and passes through the point (5, 3, 4). The shortest distance between the lines L 1 and L 2 is :

1. 38 21
2. 38 23
3. 57 21
4. 57 23

Correct answer: 38 23

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