FWIW, I still got the question wrong with the new wording because I interpreted it as “One … is true [and the other is unknown]” whereas the intended interpretation was “One … is true [and the other is false]”.
In one sense this is a communication failure, because people normally mean the first and not the second. On the other hand, the fact that people normally mean the first proves the point—we usually prefer not to reason based on false statements.
Thanks for the advice. It was a mistake. I have updated it to: “Only one of the following premises is true about a particular hand of cards”.
FWIW, I still got the question wrong with the new wording because I interpreted it as “One … is true [and the other is unknown]” whereas the intended interpretation was “One … is true [and the other is false]”.
In one sense this is a communication failure, because people normally mean the first and not the second. On the other hand, the fact that people normally mean the first proves the point—we usually prefer not to reason based on false statements.