Data Sufficiency
Data Sufficiency questions test your ability to determine whether given statements are sufficient to answer a question. You are not required to solve the problem fully, but to check sufficiency.
Fundamental Principles
Data Sufficiency
A problem-solving approach where you decide whether the given information is enough to answer a question.
Statement
A piece of information provided to help solve the question.
Essential Formulation Tips
- Do not fully solve unless required.
- Check each statement independently first.
- Avoid assumptions beyond given data.
- Focus on sufficiency, not exact answer.
Shortcut Execution Techniques
- Test Statement I → then Statement II → then combined.
- If one statement alone answers → stop there.
- Use elimination method.
- Watch for hidden conditions.
Contextual Inquiries (FAQs)
Q: What is the key idea in data sufficiency?
A:
Q: Should we combine statements always?
A:
Example Breakdown: Basic Data Sufficiency
Basic DS.From I: x = 3 → sufficient.
From II: x = 3 → sufficient.
Either statement alone is sufficient.
Final Answer: A or B.
Example Breakdown: Combined Sufficiency
Common exam pattern.I alone → insufficient.
II alone → insufficient.
Together: numbers are 4 and 5 → sum = 9.
Final Answer: Both together sufficient.
Data Sufficiency Practice Questions
Solve important data sufficiency questions for SSC, banking, CAT, GMAT, and placement exams.
Q1. What is x? I. x + 5 = 10 II. x = 5
Q2. Is a number even? I. It is divisible by 2 II. It is divisible by 4
Q3. What is the value of y? I. y + x = 10 II. x = 5