The girl, a student of BA Ist year, had come to Ambala from her village Babial to appear in an examination at a city college yesterday.
After the examination, when she was on way to Ambala Cantt bus stand to catch a bus, three youths intercepted her path and dragged her into their car, police said.
The trio took her to Ramgarh Majra village where they raped her and fled after committing the crime, police said.
The victim narrated the incident to her parents, who reported the matter to police on Monday.