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

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.