8. At the start of flu season. Dr. Anna Ahmeed examines 50 patients over two days. Of those 50 patients. 30 have a headache. 24 have a cold. and 12 have neither symptom. Some patients have both symptoms. (a) Draw a Venn diagram and determine the number of patients that have both symptoms (b) Find the probability that a patient selected at random has just a headache has a headache or a cold (ili) does not have cold symptoms