Is the question
If so the give tells you that (complement).
So .
At the start of flue 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 symptoms. Some patients have both symptoms.
Draw a Venn diagram and determine the number of patients that have both symptoms.
How do I figure out how many have both?
The answer is this (8a):