Is Raplh lying or not?

Level 1

Consider the following exchange:

  • Teacher: How could you do that, Ralph?
  • Ralph: I didn't teacher, I swear.
  • Donny: Ralph is lying, Sir!
  • Anthony: Donny is telling the truth, Sir! I support him
  • Yuno: Don't be ridiculous, Anthony. You're the one that's lying.

What's the conclusion of this?

Assumptions

  • Yuno can only tell the truth.
Ralph is telling the truth Ralph is telling a lie

Abyoso Hapsoro by Abyoso Hapsoro , 22, Indonesia

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1 solution

Nelson Mandela
May 4, 2015

lets start from the bottom.

Yuno told Anthony is lying.

As, Anthony supports Donny, Donny is lying that Ralph is lying.

So, Ralph is telling the truth.

1 Helpful 0 Interesting 0 Brilliant 0 Confused

Why can't Yuno be lying?

Calvin Lin Staff - 6 years, 1 month ago

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I feel that we have to build up from Yuno's statement to verify whether Ralph was lying or now. So, I considered Yuno's statement to be true as no other person is opposing or supporting Yuno.

Nelson Mandela - 6 years, 1 month ago

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Thanks. I've added the assumption that Yuno is telling the truth.

Calvin Lin Staff - 6 years, 1 month ago

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