MathematicsMedium249×since 2002Q2494Let 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 :A88B90C86D84Check answerSkip