premise: The Alfa Romeo Brera and the Alfa Romeo Spider (Type 939) are two sports cars manufactured by Alfa Romeo respectively between 2005-2010 and 2006-2010. The Brera is a 2+2 coupé, while the Spider is its roadster version. Both models were built by Pininfarina.
hypothesis: The Alfa Romeo Brera and the Alfa Romeo Spider were manufactured for the same duration of time  
reason: The statement says that the Brera was manufactured from 2005-2010, while the Spider was 2006-2010, so it was not the same span of time. The computer was likely fooled because it could not distinguish between the significance of the dates given.