Unit 8 · Detecting Reasoning Errors

Architect Career — Necessary vs Sufficient

Lesson 12 of 34

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About this lesson

When a rule says "you NEED X to do Y," having X does not guarantee Y — it only rules you out if X is missing. Will and Evie show exactly the difference between getting this right and getting it wrong.

Chapters

0:00Introduction
0:20Question
1:03Strategy
1:32Step 1: Read the rule — necessary conditions
2:06Step 2: Check Will — sufficient-condition trap
2:34Step 3: Check Evie — pick the answer
3:15Correct answer

Question

To become a successful architect, you need to be creative and also have excellent attention to detail.

Will said: "Sally is creative – she loves drawing and painting – and always checks her written work carefully. She's sure to become a great architect."

Evie said: "James enjoys writing stories and has a vivid imagination, but he struggles with detailed tasks. Architecture is probably not for him."

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

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