Question

Which of the following can be used as a variable?

• A. $5$
• B. $a$
• C. $\frac{13}{5}$
• D. $\pi$

Answer 1

The correct option is B $a$

A variable is a symbol representing a quantity whose value is unknown.. Generally, we use a single letter to represent a variable.

$5$ is an integer, which has a fixed value. It cannot be used as a variable.

$a$ can be used as a variable.

$\frac{13}{5}$ also has a fixed value, which cannot be used as a variable.

$\pi$ is a constant that has a fixed value close to the value of $\frac{22}{7}$. Hence it cannot be used as a variable.