GCSE(F) GCSE(H)

**Venn Diagrams** are used to display set notation. A Venn diagram consists of one or more circles within a rectangle. The rectangle defines the Universal Set, and each circle is a different set within the Universal Set. Elements not in a set are shown within the rectangle.

If two dice are thrown and added together:

Venn Diagrams can be used to determine the interaction of sets:

1. Given a set of integers from 1 to 15, set A = {multiples of two} and set B = {multiples of three}. The Venn Diagram has been started. What numbers go in the part of the diagram labelled *x*?

Answer: `A nn B = {6, 12}`

`A={2,4,6,8,10,12,14}` and `B={3,6,9,12,15}`

Part *x* is A overlapping B `A nn B = {6, 12}`.

2. For the Venn Diagram, above, what numbers go into the part of the diagram marked *y*?

Answer: `A nn B^c = {2, 4, 8, 10, 14}`

`A={2,4,6,8,10,12,14}` and `B^c={1,2,4,5,7,8,10,11,13,14}`

Elements in A and not in B: `A nn B^c = {2, 4, 8, 10, 14}`

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