Have I none -
But that man’s father
Is my father’s son!
Who is speaking: The only child of his father
Who is ‘that man’: The son of the speaker
What makes this problem difficult/interesting: I think what makes this problem interesting is that it’s really purely a logic problem. There’s no background information other than understanding what a brother, sister, father, son relationship is. It’s different from other math problems in this way, in most math problems you need to be familiar with definitions and theorems to be able to solve them, but with this you only need to be able to think through a question. What I found really great about this problem is that it’s a great introduction to logical thinking. Since you don’t need any background information, it would be a great problem to start the class with to get kids thinking mathematically!
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