[sumedh]

Yes because most Indians can speak Hindi(Urdu is similar to Hindi). Hindi is the second or third language for many non native Hindi speakers.

[wizardofmysore]

Around 100+ million of 1.2 billion don't speak Hindi.

[Manishearth]

https://en.wikipedia.org/wiki/List_of_languages_by_number_of...

No, by the 2001 census it's about 50% of Indians who do not speak Hindi.

I don't see a reason for this fraction to have changed significantly.

[ucntseeme]

That's still very less than the majority.