Decision Making
Topic overview
Decision Judgement mixes formal logic, probability, argument evaluation and constraint ordering. The key is to convert natural language quickly into sets, conditions or checkable tables.
Key concepts
Draw "All A are B" as A lying entirely inside B; "Some A are B" only guarantees at least one intersection. Sufficient conditions must not be used in reverse.
Key points
- ◆All A are B does not mean All B are A
- ◆Some means there exists
- ◆Judge each of the five statements one by one in a combined-statement question
In a five-statement Yes/No combination question, all correct scores 2 marks, exactly one wrong scores 1 marks, and anything else scores 0 marks. Checking each item independently can greatly reduce cascading errors.
Key points
- ◆Do not answer on the basis of an overall impression
- ◆First determine the necessary item
- ◆Finally, check for negations
Worked examples
Try each example yourself before checking the explanation.
All mentors are trained; some volunteers are mentors. Which must be true?
Ready to practise this topic?
Practise the available questions for this topic. Difficulty labels are platform references.
Practise Decision Making →