I believe you leave it blank because the n symbol means intersection. You shade the parts that are combined or that are intersecting, but A and B is not intersecting with one another, so there's nothing to shade. Correct me if im wrong though:)
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I believe you leave it blank because the n symbol means intersection. You shade the parts that are combined or that are intersecting, but A and B is not intersecting with one another, so there's nothing to shade. Correct me if im wrong though:)