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TSA 2012 · Question 48 · Logic

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In the elections for the mayor of Bitton, the single transferable vote system is used. In this, each voter places a '1' beside the candidate they most want and a '2' beside their second choice. Voters may only vote for two candidates. In the first round of counting, all the '1' votes are counted. If no candidate has over 50% of the votes, the bottom candidate in the poll drops out and the '2' votes of all those who voted for this candidate are added to the appropriate other candidates. This process continues until one candidate has over 50% of the vote; this person is then elected mayor.

The votes after the first round of counting were as follows:

Question diagram

How many candidates can still win?