Alvin hosted a party. His guests could choose spaghetti with meatballs or spaghetti without meatballs as their entrée; broccoli or a salad as their side; and lemonade , tea, punch, or water as their beverage. Everyone selected an entrée, side , and beverage . Alvin ran out of broccoli and punch . What is the difference in the probability of someone selecting spaghetti without meatballs , a salad, and tea after he ran out of the broccoli and punch than before he ran out ? Justify your response .