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TSA 2013 · Question 49 · Optimisation

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At committee meetings of the Massing Social Club motions are carried or defeated by a simple majority, abstentions being ignored.

At the last meeting a proposal to install a satellite dish was defeated by 8 votes to 5 with 10 committee members abstaining. However, because of the large number of abstentions it was decided that the matter should be discussed further at the next meeting and a vote taken again.

What is the minimum number of committee members who must change the way they voted if the result is to be reversed at the next meeting?