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Let Q be the mirror image of the point P(1, 0, 1) with respect to the plane S: x + y + z = 5. If a line L passing through (1, – 1, – 1), parallel to the line PQ meets the plane S at R, then QR 2 is equal to :

1. 2
2. 5
3. 7
4. 11

Correct answer: 5

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