Four candidates A, B, C, and D finish a race such that A reaches before B, B reaches before D, and C also reaches before D. Based only on this information, which candidate certainly does not finish last?
- A
- B
- C
- D
Explanation
From the given information:
1. A reaches before B → A < B
2. B reaches before D → B < D
3. C reaches before D → C < D
Combine 1 and 2: A < B < D
Combine with 3: C < D
So D is after both B and C. That means D cannot be last because someone is definitely behind D? Wait no — "last" means finishes after everyone.
From A < B < D, D is after A and B.
From C < D, D is after C too.
So D finishes after A, B, and C.
Therefore D certainly finishes last.
Last verified on 03-09-2026
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