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Difficulty: MediumValue vs. Yes/No Data Sufficiency Decision Logic

In a GMAT Data Sufficiency 'Yes/No' question, a statement that restricts a variable to a domain of values for which the condition in the question stem is false for every value in that domain is insufficient to answer the question.

Answer: Answer

Answer

False. A statement that consistently yields a 'No' answer for all permissible values provides a definitive answer and is therefore sufficient.
The correct evaluation is False. In GMAT Data Sufficiency 'Yes/No' decision logic, a statement provides sufficient information if it yields a single, conclusive answer to the question stem. If a statement restricts a variable such that the stem condition is false for every possible value, the answer to the question is conclusively 'No'. Because the question is answered with certainty, the statement is sufficient.

Step-by-Step Solution

1
Define the criterion for sufficiency in GMAT 'Yes/No' Data Sufficiency questions.
A statement is sufficient if it allows the question in the stem to be answered with certainty—either always 'Yes' or always 'No'.
Sufficiency depends on determinism, not on receiving an affirmative result.
2
Analyze the scenario where the stem condition is false for every value in the statement's restricted domain.
Because every permissible value makes the condition false, the answer to the stem's question is guaranteed to be 'No'.
There is no ambiguity or variation in outcome across the allowed values.
3
Evaluate the statement's claim of insufficiency.
The claim that such a statement is 'insufficient' is false because a deterministic 'No' satisfies all requirements for data sufficiency.
Insufficiency only occurs when a statement permits both 'Yes' and 'No' answers under different allowed values.

Key Concept

Definitive Answer Criterion in Yes/No Data Sufficiency Logic
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Topics

Value vs. Yes/No Data Sufficiency Decision Logic

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