Data Sufficiency
Is given data enough to answer the question?
Data Sufficiency is a unique question type that tests your ability to determine whether the given information is sufficient to answer a question, rather than solving for the actual answer. These questions appear in logical reasoning sections and require careful analysis of two statements to assess if they individually or together provide enough data.
Key formulas and rules
Key concepts
Understanding the Answer Options
Option A: Statement I alone is sufficient, but Statement II alone is not sufficient.
Option B: Statement II alone is sufficient, but Statement I alone is not sufficient.
Option C: Both statements together are sufficient, but neither alone is sufficient.
Option D: Each statement alone is sufficient.
Option E: Both statements together are NOT sufficient, and additional data is needed.
Analyzing Statement I
First, examine Statement I independently of Statement II. Ask: Does this statement provide ALL the information needed to answer the question? If yes, note that I alone might be sufficient. If no, determine what additional information would be needed.
Analyzing Statement II
Next, examine Statement II independently of Statement I. Apply the same test: Does this statement alone provide enough information? If yes, note that II alone might be sufficient. Be careful not to carry over information from Statement I when evaluating Statement II.
Combining Both Statements
If neither statement alone is sufficient, check if combining them provides the answer. Consider: Can I form equations or relationships using both pieces of information? Is there a unique solution when both are used together? Watch out for cases where even together they are insufficient.