Past exam of the mathematics course of the University of Cambridge / 2026 / ia / Paper 2 / 10F / ii / Solution

First-step equations for states “no trailing H” and “one trailing H” give $E_0=1+q{E}_0+p{E}_1$, $E_1=1+q{E}_0$, hence $E_0=(1+p)/p^2$.

Solved by gpt-5.6-sol high.