Unit 6
Identifying Sufficient Information
About this unit
Determine exactly which pieces of information are needed to answer a question — no more, no less. This unit trains precision thinking: you must understand what constitutes a complete proof and what information is truly necessary versus merely relevant.
What types of questions will you face?
- 1Given a claim about a hidden data table with some cells missing, identify which specific cells must be checked to test the claim
- 2Choose the two statements from a list that together prove a given conclusion
- 3Given a customer's requirements, identify which pieces of information are sufficient to determine if a product qualifies
- 4Find which single additional fact would be enough to determine a missing quantity
- 5Verify logical completeness — can the conclusion be reached from the given premises alone?
Skills you will build
- Understanding what "sufficient" means in a logical context vs. "related" or "helpful"
- Testing whether a combination of statements together prove a conclusion
- Reading data tables with partial information to identify the critical gaps
- Working backwards from a conclusion to determine what premises are required
- Evaluating whether given information overcounts, undercounts, or exactly meets what's needed
By the end of this unit, you will be able to
- Determine what information is logically necessary and sufficient to verify any statement
- Avoid the trap of collecting too much or too little evidence for a conclusion
- Work efficiently in logic and reasoning problems by identifying the minimum required information
- Build a strong foundation for higher-level logical and mathematical proofs
Difficulty profile
Easy difficulty (avg 2.20). Questions require careful logical thinking but are rarely tricky once you understand what "sufficient" means. Practice with the data-table style questions first.
Exam tip: Identifying Sufficient Information
For data-table questions: look at exactly what the claim says, then ask which cells you MUST know to test it. Often you need to check the "yes/yes" cell and the "yes/no" cell — and nothing else.
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