Unit 8 · Detecting Reasoning Errors
School Excursion — Permission Slip Logic
Lesson 20 of 34
About this lesson
50 excursion places go to the first 50 students to hand in slips by Friday. Megan has already handed hers in. Kate is handing in on Friday. Both think the outcome is certain. Both are wrong — and for different reasons.
Chapters
Question
To be able to go on the school excursion, permission slips must be handed in by Friday. There are only 50 places available, and these are allocated to the first 50 students to hand in their permission slips.
Megan said: “I’ve already handed in my slip, so I’ll definitely get a place on the excursion.”
Kate said: “I won’t be able to hand my slip in until Friday, so I won’t get a place on the excursion.”
If the information in the box is true, whose reasoning is correct?
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