4. In a survey of university students, 65 had taken mathematics course, 95 had taken chemistry course, 60 had taken physics course, 30 had taken mathematics and physics, 25 had taken mathematics and chemistry, 20 had taken chemistry and physics course, and 15 had taken all the three courses. (a) Draw a Venn Diagram to appropriately represent the above data. (b) With the help of your Venn Diagram, find how many students had taken one course only.

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