Hi Roshan,
This is a 2014 TISSNET question. We generally specify if there are elements falling outside the categories; however, in most cases, we assume that the set contains all the elements. In this case, it has been stated that 60 people like Indian classical music; thus, it is safe to assume that those who like one of the two given types fall under this banner and there are no values outside these sets. Additionally, the possibility of there being more than two types of classical music unnecessarily complicates the question. Nevertheless, given that this is a previous paper question, there's very little that we can do to tweak it. I hope this helps!