In this scenario, marathoners A, B, C and D completed a marathon, and each of them made a statement. You know that only the person who came fourth spoke the truth, and that the other marathoners lied, but you don't know who.
Mention your answer as the order of which the people's position are
For example:
A = , B = , C = and D =
A is replaced with , B is replaced with , C is replaced with , and D is replaced with
We then type it as " "
.
.
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The statements made by the marathoners:
Marathoner 's statement
Marathoner speaks the truth and I am placed either or
Marathoner 's statement
I speak the truth and I am placed
Marathoner 's statement
Marathoner speaks lies and I am not
Marathoner 's statement
Marathoner speaks lies and I finished before three people
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C & D accused each other, so one of them told the truth and the other lied. Thus, we know that both A & B are lying somehow. A can't be the 2nd or 3rd as they claimed, and as a liar, cannot be the 4th either, so A finished first. Now, we know that D is lying since they can't get the first place that's actually A's, so C told the truth as the fourth finisher.
Anyway, there's no more clues to solve for B and D, but they must be in the second and third positions in some way, but we have 3 tries to make a guess, so our possible answers are 1243 and 1423.