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Combinatorics Difficulty 2.0 Junior Find the answer United Kingdom

Amy, Bob, Cat and Dee occupy the top four positions in a chess tournament. The sum of Amy's position, Bob's position and Dee's position is 6. The sum of Bob's position and Cat's position is 6. Bob finished ahead of Amy. Who came first in the tournament?

(A) Amy (B) Bob (C) Cat (D) Dee (E) You can't be certain

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