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To find out the likelihood of voters preferring Candidate 3 or 4, we need to first add up the number of supporters for Candidate 3 and Candidate 4.
Candidate 3: 450 supporters
Candidate 4: 550 supporters
Total supporters for Candidates 3 and 4: 450 + 550 = 1,000 supporters
If 1,000 more voters are surveyed, it is likely that around 1,000 of them will prefer Candidate 3 or 4, since the total number of supporters for Candidates 3 and 4 is already 1,000.