B is the brother of A. How is A related to B? Statement I: A is the sister of…
2024
B is the brother of A. How is A related to B?
Statement I: A is the sister of C.
Statement II: E is the husband of A.
- A.
The data in statement I alone is sufficient to answer the question, while the data in statement II alone is not sufficient to answer the question
- B.
The data given in both statement I and statement II together is not sufficient to answer the question
- C.
The data in statement II alone is sufficient to answer the question, while the data in statement I alone is not sufficient to answer the question
- D.
If the data in either statement I alone or statement II alone is sufficient to answer the question
Attempted by 3 students.
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Correct answer: D
Concept: In blood-relation data-sufficiency questions, a relation term that names only one person's gender (like 'brother') fixes that person's sex but leaves the other person's gender - and therefore their exact relational label - undetermined until some other clue reveals it independently.
Application: 'B is the brother of A' fixes B as male but does not by itself tell us whether A is male or female, so we cannot yet say if A is B's brother or B's sister.
Statement I says 'A is the sister of C.' The word 'sister' is gender-specific, so this alone fixes A as female - combined with the stem, A is B's sister.
Statement II says 'E is the husband of A.' The word 'husband' is also gender-specific (only a female can have a husband), so this alone also fixes A as female - again making A the sister of B.
Cross-check: Reading Statement I on its own reaches the sister conclusion; reading Statement II on its own, with Statement I set aside, reaches the identical conclusion. Since each statement independently and completely settles A's gender - and hence the relationship - neither one needs the other.
So the data in either statement I alone or statement II alone is sufficient to answer the question.