I figure these exercises out by numeric association. I see a 3, so I know right away that there <em>might</em> be a 9 somewhere. So, you start by plugging 3 in for THEN plug in for sinse there are <em>twise</em><em> </em>the quantity of than there are of Now, doing so will give you This tells you to try another pattern, so go with plugging in for and in for . Doing so gives you what you are looking -- Therefore, the association wourked perfectly. ☑