А) ; б) .

It seems that you've input characters "а)" and "б)" which often precede items in a list in Russian and other Slavic languages, followed by a "space" after "а)" and a "period" after "б)". If these are meant to indicate items for which you want assistance with preparing for university exams, please provide the specific content or questions you have for each item. I would be more than happy to assist you with your preparation.