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If $A$ is the event that a certain student is taking a course in calculus and $B$ is the event that the student is taking a course in applied mechanics, what events are represented by the shaded regions of the four Venn diagrams ?

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The shaded region of the first diagram represents the event that the student is taking a course in calculus. That of the second diagram represents the event that the student is not taking a course in calculus. The shaded area of the third diagram represents the event that the student is taking a course in calculus and/or a course in applied mechanics. Finally, that of the fourth diagram represents the event that the student is taking a course in calculus as well as a course in applied mechanics.
by Diamond (40,719 points)

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