Bianca eliminated by Varun Vote . He has to chose from his pity three lovely faithful girl for scapegoat and he choses Bianca against all expectation of girls , Vishal and Ranvijay. He refused to speak on why he vote against Bianca because it was already certain that Vishal will target her. Ultimately he speaks that he likes Heena and Bianca was just a distraction to him.
BUT I will give you the REASON HERE ,Varun likes Prianca more than any girl. One can guess by look and sex appeal of Prianca. Varun has assume that Vishal will vote against Prianca and not Bianca for some reason then their will be a tie or Prianca eliminated. Because in a tie situation safe girls will only vote which will include Shradhha , Ritu and one girl either Heena or Bosky. In these three only Ritu supports Prianca. Hence She will be definetly eliminated.
Moreover in last episode both Bianca and heena together made Shradhha survives whose dissappointment showed on Varun never lose face. Now varun is open while Vishal has still moma’s boy tag and Shradhha sticker on him.