Q90. Let $\mathrm { P } ( \alpha , \beta , \gamma )$ be the image of the point $\mathrm { Q } ( 1,6,4 )$ in the line $\frac { x } { 1 } = \frac { y - 1 } { 2 } = \frac { z - 2 } { 3 }$. Then $2 \alpha + \beta + \gamma$ is equal to $\_\_\_\_$ \section*{ANSWER KEYS} \begin{center} \begin{tabular}{|l|l|l|l|} \hline 1. (4) & 2. (1) & 3. (3) & 4. (3) \\ \hline 9. (3) & 10. (1) & 11. (4) & 12. (1) \\ \hline 17. (2) & 18. (2) & 19. (3) & 20. (3) \\ \hline 25. (5) & 26. (5) & 27. (10) & 28. (22) \\ \hline 33. (2) & 34. (2) & 35. (3) & 36. (3) \\ \hline 41. (3) & 42. (2) & 43. (3) & 44. (4) \\ \hline