Use a circle diagram to solve each problem. See Example 7.
PETS When asked about their pets, a group of 35sixth-graders responded as follows:
• 21 said they had at least one dog.
• 11 said they had at least one cat.
• 5 said they had at least one dog and at least one cat.
How many of the students do not have a dog or a cat?
Reference Example 7
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