{"id":9613,"date":"2022-01-18T00:23:42","date_gmt":"2022-01-17T18:53:42","guid":{"rendered":"https:\/\/mathemerize.com\/?p=9613"},"modified":"2022-01-18T00:23:46","modified_gmt":"2022-01-17T18:53:46","slug":"intersection-of-sets-definition-and-venn-diagram-with-examples","status":"publish","type":"post","link":"https:\/\/mathemerize.com\/intersection-of-sets-definition-and-venn-diagram-with-examples\/","title":{"rendered":"Intersection of Sets – Definition and Venn Diagram with Examples"},"content":{"rendered":"
Here you will learn what is the intersection of sets with definition and venn diagram and examples.<\/p>\n
Let’s begin –<\/p>\n
Definition<\/strong> : Let A and B be two sets. The intersection of A and B is the set of all those elements that belong to both A and B.<\/p>\n The intersection of A and B is denoted by \\(A \\cap B\\) (read as “A intersection B”)<\/p>\n Thus, \\(A \\cap B\\) = {x : x \\(\\in\\) A and x \\(\\in\\) B}.<\/p>\n Clearly, x \\(\\in\\) \\(A \\cap B\\) \\(\\iff\\) x \\(\\in\\) A and x \\(\\in\\) B.<\/p>\n In the given figure, the shaded region represents \\(A \\cap B\\). This is the venn diagram for intersection of sets<\/strong>.<\/p>\n Evidently, \\(A \\cap B\\) \\(\\subseteq\\) A, \\(A \\cap B\\) \\(\\subseteq\\) B.<\/p>\n Note<\/strong> : If \\(A_1\\), \\(A_2\\), …. , \\(A_n\\) is a finite family of sets, then their intersection is denoted by \\(A_1 \\cap A_2 \\cap ….. \\cap A_n\\).<\/p>\n Example<\/strong><\/span> : If A = {1, 2, 3, 4, 5} and B = {1, 3, 9, 12}, then \\(A \\cap B\\) = {1, 3}.<\/p>\n Example<\/strong><\/span> : If A = {1, 2, 3, 4, 5, 6, 7}, B = {2, 4, 6, 8} and C = {4, 6, 7, 8, 9, 10, 11}, then find \\(A \\cap B\\) and \\(A \\cap B \\cap C\\).<\/p>\n Solution<\/span><\/strong> : \\(A \\cap B\\) = {2, 4, 6}<\/p>\n \\(\\therefore\\) \\(A \\cap B \\cap C\\) = {4, 6}<\/p>\n If A, B and C are finite sets, and U be the finite universal set, then<\/p>\n n(\\(A \\cap B\\)) = n(A) + n(B) – n(\\(A \\cup B\\))<\/p><\/blockquote>\n where, n(A) = number of elements in set A<\/p>\n n(B) = number of elements in set B<\/p>\n n(\\(A \\cup B\\)) = number of elements in union of sets A and B<\/p>\nFormula to Find Number of Elements in A Intersection B<\/h2>\n