View 1 a 2 b 2 a 1 b PowerPoint (PPT) presentations online in SlideServe. SlideServe has a very huge collection of 1 a 2 b 2 a 1 b PowerPoint presentations. You can view or download 1 a 2 b 2 a 1 b presentations for your school assignment or business presentation. Browse for the presentations on every topic that you want.