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A picture of a Venn diagram is in the related links.

They are useful because they help you map out problems such as "If there are 3 students in math, 5 students in science and 6 students in total, how many are in both math and science?" To this, you can use the Venn diagram to reason that since there seem to be 8 students in total if math and science are separate, there must be 2 students in both classes.

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Q: What are Venn diagrams and how are they useful?
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