Unit 8 · Detecting Reasoning Errors

Gold Star Students — Conditional Logic Error

Lesson 9 of 34

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About this lesson

Harder error-detection items give you a strict if-then rule and two speakers — you judge who follows the logic and who makes an illegal leap.

Chapters

0:00Introduction
0:21Question
1:04Strategy
1:34Step 1: Check Dante — direct rule application
1:58Step 2: Check Cleo — contrapositive
3:09Correct answer

Question

Every student who receives a Gold Certificate at Ferndale School has completed all 30 required assignments.

Cleo: "Marcus has not completed all 30 required assignments, so he cannot have received a Gold Certificate."

Dante: "And if Priya has received a Gold Certificate, it is guaranteed that she has completed all 30 required assignments."

If the information in the box is true, whose reasoning is correct?

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