Purplemath's algebra lessons are written with the student in mind. These lessons emphasize the practicalities rather than the technicalities, demonstrating dependable techniques, warning of likely "trick" questions, and pointing out common mistakes.
The union of two sets, denoted A∪B ("A union B"), is the set of all members contained in either A or B or both.
Once you understand Union and Intersection, you can create members of "VENN WORLD"
Algebra and geometry tutorials
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