Which of the following is a variable?

5

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a

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\frac{13}{5}

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π

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Solution

The correct option is B $a$
A variable is an entity which varies or changes its value or is not consistent.
Generally, we use a letter to represent a variable.

$5$ and $\frac{13}{5}$ have a fixed value. Hence these are not variables.
The value of $π$ is fixed, which is, $\frac{22}{7}$ . Hence $π$ is not a variable.
But the letter $a$ can take any value and its value is not fixed. So, $a$ is a variable.

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