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If L 1 is the line of intersection of the planes 2 x – 2 y + 3 z – 2 =0, x – y + z + 1 = 0 and L 2 is the line of intersection of the planes x + 2 y – z – 3 = 0, 3 x – y + 2 z – 1 = 0, then the distance of the origin from the plane, containing the lines L 1 and L 2 , is:

1. 2 4 1
2. 2 3 1
3. 2 2 1
4. 2 1

Correct answer: 2 3 1

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