Direction: Study the following alphabetical sequence and answer the question based on it.
$$\text{GAGHUTAAKHGAOYYDKKVRABICDDCRFFAHAHAIH}$$

The number of vowels that are absent in the above series is:

The English alphabet contains $5$ core vowels: A, E, I, O, U.
Let's check the presence of each vowel individually within the given string:

$$\text{GAGHUTAAKHGAOYYDKKVRABICDDCRFFAHAHAIH}$$

* A: Present multiple times (e.g., GAGH...)
* E: Absent (Nowhere to be found in the entire sequence)
* I: Present (e.g., ...ABIC...)
* O: Present (e.g., ...GAOYY...)
* U: Present (e.g., ...GAGHUT...)

Only $1$ vowel (E) is missing from the series.