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Answer: There are 24 patients who had allergies or ear infections but not both.
Step-by-step explanation:
Since we have given that
Number of patients having ear infections = 9
Number of patients having allergies = 15
We need to find the number of patients had allergies or ear infections, but not both.
According to Venn diagram , we get that
Number of patients had allergies or ear infections is given by
Hence, there are 24 patients who had allergies or ear infections but not both.