The tree diagram shows the choices of steak and chicken in the top row. Three branches from each main dishes show corn, green beans, and broccoli. Two branches from each vegetable show lemon tart and strawberry ice cream. The tree diagram shows that there are 12 different possibilities for the menu. Only one of those possibilities is chicken, broccoli, and strawberry ice cream. So the probability of having chicken, broccoli, and strawberry ice cream at her dinner party is [ggfrac]1/12[/ggfrac].