Edexcel FD2 2023 June — Question 1

Exam BoardEdexcel
ModuleFD2 (Further Decision 2)
Year2023
SessionJune
TopicNetwork Flows

1. \begin{figure}[h]
\includegraphics[alt={},max width=\textwidth]{ae354c58-6de8-4f94-b404-2f0feecb5bf3-02_953_1687_251_191} \captionsetup{labelformat=empty} \caption{Figure 1}
\end{figure} Figure 1 shows a capacitated, directed network of pipes. The number on each arc represents the capacity of that pipe. The numbers in circles represent a feasible flow from S to T .
  1. State the value of the feasible flow.
    (1)
  2. Find the capacity of cut \(\mathrm { C } _ { 1 }\) and the capacity of cut \(\mathrm { C } _ { 2 }\)
    (2)
  3. By inspection, find a flow-augmenting route to increase the flow by two units. You must state your route.
    (1)
  4. Prove that, once the flow-augmenting route found in (c) has been applied, the flow is now maximal.
    (3)