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Data Sufficiency — Relationships: How is X related to Y? Statement I: Y says, "I have only one brother." Statement II: X says, "I have only one sister." Decide which statements are sufficient to answer the question. Choose the correct sufficiency option.

Difficulty: Easy

Statement I alone is sufficient, but Statement II alone is not sufficient.
Statement II alone is sufficient, but Statement I alone is not sufficient.
Both statements I and II together are sufficient, but neither alone is sufficient.
Either statement I or statement II alone is sufficient.
Even both statements I and II together are not sufficient.

Correct Answer: Even both statements I and II together are not sufficient.

Explanation:

Reasoning
The statements restrict the composition of each person's siblings but do not link X and Y explicitly as siblings, cousins, or spouses.Multiple family structures satisfy both statements with different relations between X and Y (e.g., siblings in some cases, not siblings in others).

Conclusion
Relationship cannot be uniquely determined.

Final Answer
Even both statements I and II together are not sufficient.

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Data Sufficiency — Relationships: How is X related to Y? Statement I: Y says, "I have only one brother." Statement II: X says, "I have only one sister." Decide which statements are sufficient to answer the question. Choose the correct sufficiency option.

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