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| Venn Diagrams [Euler-Venn Diagrams] |
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| A Venn diagram is a pictorial representation of sets by set of points in the plane. The universal set U is represented pictorially by interior of a rectangle and the other sets are represented by closed figures viz circles or ellipses or small rectangles or some curved figures lying within the rectangle. |
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| A is a subset of B and is represented as shown in the venn diagram. |
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| Disjoint sets |
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| A and B are disjoint sets as shown in the venn diagram. |
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| If A and B are any two arbitrary sets, elements such that, some elements are in A but not in B, some are in B but not in A, some are in both A and B, and some are in neither A nor B, we represent A and B in the pictorial form as in shown in the venn diagram. |
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