 2023

Source: Oxford's released examination PDF, pages 172–175, dated 19 June 2023; questions 1, 2 and 3 occupy pages 173, 174 and 175 respectively. The solutions below follow the paper's numbering. In 2(b), both the original PDF and its transcription omit independence between $B$ and $U$; the intended independent-case answers and the consequences of this omission are distinguished below.