MathematicsHard249×since 2002Q2507If the length of the perpendicular drawn from the point P(a,4,2)P(a, 4,2)P(a,4,2), a >0>0>0 on the line x+12=y−33=z−1−1\frac{x+1}{2}=\frac{y-3}{3}=\frac{z-1}{-1}2x+1=3y−3=−1z−1 is 262 \sqrt{6}26 units and Q(α1,α2,α3)Q\left(\alpha_{1}, \alpha_{2}, \alpha_{3}\right)Q(α1,α2,α3) is the image of the point P in this line, then a+∑i=13αi\mathrm{a}+\sum\limits_{i=1}^{3} \alpha_{i}a+i=1∑3αi is equal to :A7B8C12D14Check answerSkip