Introduction to Sets Part 1

The set of best shoes.

• Well-defined

• Not well-defined

The set of even numbers from 1-10.

• Well-defined

• Not well-defined

The set of planets in the Solar System.

• Well-defined

• Not well-defined

The set of best schools.

• Well-defined

• Not well-defined

The set of beautiful teachers in Southbrook.

• Well-defined

• Not well-defined

Express the given in Set-builder or Rule Method:

 $\left\{2,4,6,8\right\}$  

• {x/x is an even number}

• {x/x is an even number less than 10}

• {x/x is any integer}

Express the given in Set-builder or Rule Method:

 $A=\left\{5,10,15,20\right\}$  

• A={x/x is a multiple of 5}

• A={x/x is a multiple of 5 less than 25}

• A={x/x is a multiple of 5 less than 20}

Express the given in Listing or Roster Method:

D={x/x is a whole number between 3 and 7}

• $D=\left\{3,4,5,6,7\right\}$

• $D=\left\{3,4,5,6\right\}$

• $D=\left\{4,5,6\right\}$

Express the given in Listing or Roster Method:

The set of all letters from a to e.

• $\left\{a,b,c,d,e\right\}$

• $\left\{b,c,d\right\}$

• $\left\{a,b,c,d\right\}$

Express the given in Listing or Roster Method:

The set of all whole numbers greater than 1 but less than 5.

•  $\left\{1,2,3,4,5\right\}$  

•  $\left\{1,2,3,4\right\}$  

•  $\left\{2,3,4\right\}$