Question contradicts with true/false teriminology!

In order to achieve the desired answer, responses from Andy, Beryl, and Cammy should be false, true & false respectively.

Please check Andy's statement:

  1. Andy - (As per explanation, if we false/negate his statement) Then it would be: Bery did not steal the necklace, I would always lie.<----------(Always/forever)

  2. Beryl - true Then it would be: Cammy stole the necklace, I did not steal the necklace

  3. Cammy - (if we false/negate his statement) Then it would be: Andy did not steal, I stole the necklace.

Contradiction: Andy's statement can not be trusted, As he always/forever lies. Explanation concludes on the basis of Andy's first part of the statement that Beryl did not steal, Though it fails to address the second part of the statement.

Note by Navdeep Kanwal
6 months, 1 week ago

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Hi Navdeep, I believe you're referring to this problem.

The first paragraph of the solution states that only one of Andy, Beryl and Cammy is telling the truth.

The second paragraph of the solution demonstrates that exactly one of Beryl and Cammy is telling the truth. This means that Andy has to be a liar.

If we know that Andy is a liar, then we can conclude that Beryl did not steal the necklace. And so Beryl's second statement is true. This also means that Beryl's first statement is true as well.

In the future, if you have concerns about a problem's wording/clarity/etc., you can report the problem. See how here.

Brilliant Mathematics Staff - 6 months ago

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