Set Theory

The meaning of the letter Z in set theory is

• Natural Number

• Integer Number

• Irrational Number

• Rational Number

The meaning of the letter N in set theory is

• Natural Number

• Rational Number

• Real Number

• Irrational Number

An example of an irrational number is

• $\pi$

• 2

• $\frac{5}{2}$

• -6

An example of an integer number is

• 0

• $\pi$

• $\sqrt{2}$

• $\frac{5}{2}$

A = {1,2} and B = {2,3} The union of set A and B is:

• $A\cup B$ ={1,3}

• $A\cup B$ ={1,2,3}

• $A\cup B$ ={2,3}

• $A\cup B$ ={1}

A = {1,2} and B = {2,3} The intersection of set A and B is:

• $A\cap B=\left\{2\right\}$

• $A\cap B=\left\{1,2,3\right\}$

• $A\cap B=\left\{1\right\}$

• $A\cap B=\left\{3\right\}$