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3D Geometry question

2021 · 24 Feb · Shift 2 · Q25
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  5. /2021 · 24 Feb · Shift 2 · Q25

3D Geometry question

2021 · 24 Feb · Shift 2 · Q25

JEE MainMathematics3D GeometryMCQ+4 / −1
Let a, b ∈\in∈ R. If the mirror image of the point P(a, 6, 9) with respect to the line x−37=y−25=z−1−9{{x - 3} \over 7} = {{y - 2} \over 5} = {{z - 1} \over { - 9}}7x−3​=5y−2​=−9z−1​ is (20, b, −-− a −-− 9), then | a + b |, is equal to :
  1. A
    88
  2. B
    90
  3. C
    86
  4. D
    84
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