 2021

Source: Oxford's released examination PDF, pages 164–167, dated 21 June 2021. Questions 1, 2 and 3 occupy bundle pages 165, 166 and 167 respectively, or pages 2, 3 and 4 of the individual paper. All three questions and every part are solved below, including all six revisions requested in 3(d). In 3(c), $c$ is understood to be an integer: the printed transition rule does not define a transition matrix for noninteger $c$.