The decimal expansion of an irrational number maybe?

Irrational numbers are those real numbers that cannot be represented in the form of a ratio.

Answer: The decimal expansion of an irrational number may be non-terminating and non-repeating

Let's look into some examples to understand 

Explanation:

The decimal expansion of an irrational number is non-terminating and non-repeating

So, the decimal expansion of an irrational number has no finite number of digits or pattern of repetition

For example, 23.41411411141111... is an irrational number.

Thus, the decimal expansion of an irrational number may be non-terminating and non-repeating.