Question

Which of the following is an irrational number ?

• A. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> $\frac{8}{2}$
• B. 1.5
• C. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> $\sqrt{2}$
• D. 9

Answer 1

The correct option is C <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> $\sqrt{2}$

An Irrational Number is a real number that cannot be written as a simple fraction.

1.5 can be written as $\frac{3}{2}$

9 can be written as $\frac{9}{1}$

All the given options can be written as simple fractions except
$\sqrt{2}$. Because $\sqrt{2}$ =1.41421.............