Data Sufficiency (Mainly Mains) — Banking Reasoning Notes Ch. 12

Introduction

Reasoning-section Data Sufficiency works exactly like its Quant counterpart — you judge whether given statements are enough to answer a question — but the statements here are logical/relational (rankings, arrangements, relationships) rather than numeric.

Standard Answer Choices

Option	Meaning
A	Statement I alone is sufficient, but Statement II alone is not
B	Statement II alone is sufficient, but Statement I alone is not
C	Both statements together are sufficient, but neither alone is
D	Either statement alone is sufficient
E	Both statements together are still not sufficient

Q. Among five friends, who is the tallest?
I. A is taller than B and C.
II. D is taller than A, but shorter than E.

Statement I alone: A is taller than only B and C, doesn't rule out D or E → not sufficient. Statement II alone: D > A but D < E — doesn't tell us about B, C, or a definite tallest → not sufficient. Together: E > D > A > B, C. E is definitely the tallest → Option C.

⚠️ Key Insight: A statement giving only a partial/relative relationship (like "taller than some, but not all") is rarely sufficient alone — check whether it establishes a complete, unambiguous order before marking it sufficient.

💡 Exam Tip: Draw a quick relationship chain or mini-diagram for each statement separately — for logical Data Sufficiency, visualising is far more reliable than reasoning purely in your head.

✅ Practice Focus: Testing arrangement/ranking statements independently · Recognising incomplete orderings · Combining two partial relationship statements into one definite conclusion.

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