Unit 12 · Multi-Step Conditional Reasoning
Semester Tests — Constraint Elimination
Lesson 14 of 30
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About this lesson
Semester pass/fail chains are the Selective version of “must be true” logic: each rule is an arrow, and one option breaks a rule no matter how you try.
Chapters
0:00Introduction
0:22Question
1:15Strategy
2:09Step 1: Rules as triggers — passing English or IT forces extra results
3:16Step 2: Option B — three contradictions at once
4:16Correct answer
Question
In semester tests, students took English, Geography, History, and IT. The following results were achieved by the class:
- Everyone who passed English also passed Geography.
- Everyone who passed IT also passed History.
- No one passed both Geography and IT.
- No one failed all four subjects.
- No one passed all four subjects.
Which one of the following is not possible?
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