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Data Sufficiency

View Questions of Data Sufficiency

Reasoning - Data Sufficiency

What is Data Sufficiency?

These questions test whether the given data is adequate to answer a question, rather than solving the question itself.

Format of Questions

Each question has a question followed by two statements. You must determine whether the data provided in one or both statements is sufficient to answer the question.

Example Questions

  • Question: What is the value of \(x\)?
    Statement I: \(x + y = 10\)
    Statement II: \(y = 4\)
    Answer: Answer: Both I and II together are sufficient.
  • Question: Is A older than B?
    Statement I: A is older than C.
    Statement II: C is older than B.
    Answer: Answer: Both statements together are sufficient.

Exam Tips

  • Do not solve the full question - only check sufficiency.
  • Test each statement alone before combining.
  • Look for unique determinability - can one and only one value/answer be obtained?
  • Apply elimination: If one statement gives multiple outcomes, it's insufficient.

Common Mistakes

  • Trying to find the exact answer instead of judging sufficiency.
  • Combining statements before testing them individually.
  • Ignoring indirect implications of a statement.

Quick Revision Checklist

  • Use standard answer format options (I alone, II alone, Both together, Neither).
  • Work on algebraic and logical sufficiency types.
  • Ensure clarity on what constitutes 'sufficient'.

Summary: Data Sufficiency questions measure logical assessment of adequacy. Practice helps in resisting the urge to solve completely and focusing on what is needed to answer.

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