These two make up an interesting combination, one of two very different types of people. The 3 is restless, energetic, and constantly on the go, with a swirl of activity, travel, and social contact which the 7 usually finds intolerable. The 7 needs quiet and solitude to recharge, and can only take so much human contact before retreating to their place of peace and quiet. Confrontation in this pairing never works well, and because of the different natures of the 3 and the 7, this is a relationship that can either last for a couple of weeks, or remain exciting and strong for a lifetime.