7 : 17 : : 9 : –––––––––– 

Logic 1

$$\begin{gathered} 7+10 = 17, \\ 9+10\to 19 \end{gathered}$$

Logic 2

$$\begin{gathered} 7\times 2+3 = 17, \\ 9\times 2+3\to 21 \end{gathered}$$

Logic 3

$$\begin{gathered} 7\times 3-4 = 17, \\ 9\times 3-4\to 23 \end{gathered}$$

$\therefore$So all option are follows