"Hol látsz egy férfit?"

Translation: Where do you see a man?

[Axel865491]

When is "egy" omitted? I thought it could be dropped on a sentence which expresses where something is "where can I find a car" can be translated into something without an "egy" right?

[vvsey]

Yes, that is correct. I guess you could omit it here, as well.

[MrtonPolgr]

Well, it kills a possible interpretation of the sentence - talking about one certain (but possibly unknown) man. It would sound more like "Where do you see (some) men?" Even the amount is unsure.