Aamir Khan (as Rancho or Funshukh Vangru), Sharman Joshi (as Raju Rastogi), R. Madhavan (as Farhan Kuraisee) were the 3 idiots from the movie "3 Idiots".
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Boman Irani played as Dr Viru Sahastrabuddhe, better known as "Virus", he was strict college director. By the end of the movie, he has changed his doctrinal method of teaching.
