3.2 Venn diagrams Mathematical Studies for the IB Diploma © Hodder Education 2010.

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3.2 Venn diagrams Mathematical Studies for the IB Diploma © Hodder Education 2010

Venn diagrams A Venn diagram is a good way of showing the elements of sets using a diagram. The Universal set U in this case contains all the integers from 1 to 24. U = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24} 1 4 3 6 9 12 15 18 21 24 8 16 20 2 5 7 10 11 13 14 17 19 22 23 U Mathematical Studies for the IB Diploma © Hodder Education 2010

Venn diagrams If the set A contains all the multiples of 3 between 1 and 24, this can be written as A = {3, 6, 9, 12, 15, 18, 21, 24}. On the diagram these can be identified by enclosing them in a circle labelled A. U A 18 1 3 4 12 6 16 23 2 24 9 20 5 22 21 8 15 10 17 7 19 14 13 11 Mathematical Studies for the IB Diploma © Hodder Education 2010

Venn diagrams If the set B contains all the multiples of 4 between 1 and 24, this can be written as B = {4, 8, 12, 16, 20, 24}. On the diagram these can be identified by enclosing them in another circle labelled B. 1 4 3 6 9 12 15 18 21 24 8 16 20 2 5 7 10 11 13 14 17 19 22 23 U A B Mathematical Studies for the IB Diploma © Hodder Education 2010

Venn diagrams The numbers 1, 2, 5, 7, 10, 11, 13, 14, 17, 19, 22, 23 all belong to the Universal set U but do not belong to either set A or set B. The numbers 12 and 24 belong to set A and set B and therefore they appear in the overlap of the two circles. The overlap of set A and set B is written A  B therefore A  B = {12,24}. 1 2 5 7 10 11 13 14 17 19 22 23 U A B 4 3 6 9 12 15 18 21 24 8 16 20 Mathematical Studies for the IB Diploma © Hodder Education 2010

Venn diagrams The numbers which belong to either set A or set B or both are described as A  B therefore A  B = {3, 4, 6, 8, 9, 12, 15, 16, 18, 20, 21, 24}. 1 2 5 7 10 11 13 14 17 19 22 23 U A B 4 3 6 9 12 15 18 21 24 8 16 20 Mathematical Studies for the IB Diploma © Hodder Education 2010