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Let Q be the mirror image of the point P(1, 2, 1) with respect to the plane x + 2y + 2z = 16. Let T be a plane passing through the point Q and contains the line λ + = k ˆ – r r ) k ˆ 2 j ˆ i ˆ ( + + , λ ∈ R. Then, which of the following points lies on T?

1. (2, 1,0)
2. (1, 2, 1)
3. (1, 2, 2)
4. (1, 3, 2)

Correct answer: (1, 2, 1)

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