Unit 8 · Detecting Reasoning Errors
Roller-Blading Skills — Inverse Fallacy
Lesson 25 of 34
About this lesson
Four rules about roller-blading, roller-skating and ice-skating. Wei says Shane's years of ice-skating mean he can roller-skate. Talia says Hannah can't roller-blade so she can't roller-skate either. One of them chains the rules correctly — and Rule 3 is the key to catching the other's mistake.
Chapters
Question
The skills required for roller-blading, roller-skating and ice-skating are very similar.
- Anyone who can roller-blade can also roller-skate.
- Anyone who can roller-blade can also ice-skate.
- Not everyone who can roller-skate can roller-blade.
- Anyone who can ice-skate can also roller-blade.
Wei: "Shane has been ice-skating for years. He will have no trouble roller-skating."
Talia: "Hannah is unable to roller-blade. She won't be able to roller-skate."
If the information in the box is true, whose reasoning is correct?
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