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Lefties and righties (Posted on 2015-06-10) Difficulty: 1 of 5
In Leftwrite, every inhabitant is either a lefty or a righty. Lefties write true statements with their left hand and false statements with their right hand. Righties write false statements with their left hand and true statements with their right hand. An inhabitant wrote, "My father and I are both lefties." With the same hand, he wrote, "My father is a righty." What type is the inhabitant, what type is his father, and what hand did he write the statements with?

See The Solution Submitted by Math Man    
Rating: 4.6667 (3 votes)

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Solution solution Comment 2 of 2 |
Both statements have the same truth value but can't both be true so both are false: the father is a lefty.

To make the first statement false, then, the inhabitant who is writing must be a righty.

Since both statements are false, this righty must be writing with his left hand.

  Posted by Charlie on 2015-06-10 11:11:41
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