Edexcel D1 2016 January — Question 1

Exam BoardEdexcel
ModuleD1 (Decision Mathematics 1)
Year2016
SessionJanuary
TopicPermutations & Arrangements
TypeAssignment/allocation matching problems

1. \begin{figure}[h]
\includegraphics[alt={},max width=\textwidth]{a3ca2743-2311-4225-8b78-dcd5eb592704-2_741_558_370_372} \captionsetup{labelformat=empty} \caption{Figure 1}
\end{figure} \begin{figure}[h]
\includegraphics[alt={},max width=\textwidth]{a3ca2743-2311-4225-8b78-dcd5eb592704-2_734_561_374_1114} \captionsetup{labelformat=empty} \caption{Figure 2}
\end{figure} Figure 1 shows the possible allocations of six workers, \(\mathrm { A } , \mathrm { B } , \mathrm { C } , \mathrm { D } , \mathrm { E }\) and F , to six tasks, 1, 2, 3, 4, 5 and 6. Figure 2 shows an initial matching.
  1. Starting from this initial matching, use the maximum matching algorithm to find an improved matching. You must list the alternating path used and state your improved matching.
  2. Explain why it is not possible to find a complete matching. Now, exactly one worker may be trained so that a complete matching becomes possible.
    Either worker A can be trained to do task 1 or worker E can be trained to do task 4.
  3. Decide which worker, A or E , should be trained. Give a reason for your answer. You may now assume that the worker you identified in (c) has been trained.
  4. Starting from the improved matching found in (a), use the maximum matching algorithm to find a complete matching. You must list the alternating path used and state your complete matching.