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The mirror image of the point (1,2,3) in a plane is       3 1 ,– 3 4 ,– 3 7 – .Which of the following points lies on this plane ?

1. (1, – 1, 1)
2. (–1, – 1, 1)
3. (1,1,1)
4. (–1, –1, –1)

Correct answer: (1, – 1, 1)

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