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Unit 2: Test every picture

What must be true

What "must be true" means

Groups: all, some and no

Read this before the quizzes

Groups 1

Groups 2

The meaning of some

Answers and why: must be true and groups

Rules run one way

If-then rules run one way

Unless, either-or and not both

Rules 1

Rules 2

Unless

Answers and why: rules

Judgements and Yes/No sets

True, false or cannot say

Yes/No sets and how they are marked

Three-way judgement

Marks

A familiar trap

Answers and why: judgements and Yes/No sets

Traps and real tests

The traps examiners set

How real tests format deduction

Unit 2 of Logical and Non-verbal Reasoning: deduction. Groups, if-then rules, unless and either-or, true, false or cannot say, and Yes/No conclusion sets.

Deduction: what must be true. This unit has one move: a conclusion must hold in every picture that fits the statements.

Logical and Non-verbal Reasoning Unit 2: Deduction, what must be true

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