Who is the father of M? I. A and B are brothers. II. B's wife is sister of M's…
2025
Who is the father of M?
I. A and B are brothers.
II. B's wife is sister of M's wife
- 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 in statement II alone is sufficient to answer the question, while the data in statement I alone is not sufficient to answer the question
- C.
If the data in either in statement I alone or in statement II alone is sufficient to answer the question
- D.
If the data in both the statements I and II together is not sufficient to answer the question
Show answer & explanation
Correct answer: D
Concept: In blood-relations data-sufficiency questions, a statement is sufficient only when it pins down the exact relationship asked for. A fact that merely links two people through marriage or siblinghood, without stating who someone's parent is, cannot answer a "father of" question.
Statement I alone: A and B are brothers. This sentence relates only A and B to each other; M does not appear in it at all, so it gives no information about M's father.
Statement II alone: B's wife is the sister of M's wife. This tells us B and M are married to sisters, connecting B and M by marriage, but it still does not name a parent of M.
Statements I and II together: We now know A and B are brothers, and B and M are married to sisters. Neither fact, alone or combined, states who is M's father; no parent-child link involving M is ever given.
Cross-check: two different families can be built that satisfy both statements, one where M's father happens to belong to A and B's family, another where the two families are completely unconnected. Since both are consistent with the given data, the data can never single out M's father.
Hence, the data in both statements together is not sufficient to answer the question.