In Each Case, Which of Mill's Methods Is Being Used

Short Answer

In each case, which of Mill's Methods is being used?
-A patient keeps getting sick when he eats fast foods, so the doctor has the patient eliminate all greasy foods. The symptoms disappear. Then greasy foods are added back into the diet, one at a time. When the cheeseburger is added back, the symptoms reappear. The doctor concludes that the cheeseburger caused the reaction.