If the image of the point \( P(1, 0, 3) \) in the line joining the points \( A(4, 7, 1) \) and \( B(3, 5, 3) \) is Q\((\alpha, \beta, \gamma)\), then \( \alpha + \beta + \gamma \) is equal to:
\( \dfrac{47}{3} \)
\( 18 \)
\( \dfrac{46}{3} \)
\( 13 \)