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How is D related to A? Statement I: A is the brother of B, and B is the mother of D. Statement II: D is the son of A's sister B. Which statement(s) is/are sufficient to answer the question?

Competition practiceData Sufficiency
  • AEither statement alone is sufficient
  • BStatement I alone is sufficient but Statement II alone is not
  • CStatement II alone is sufficient but Statement I alone is not
  • DBoth statements together are needed (neither alone is sufficient)

Step-by-Step Solution

From I, A is D's maternal uncle but D's gender is unknown, so D is nephew or niece (ambiguous). From II, D is the son of A's sister, so D is A's nephew.
Answer: C) Statement II alone is sufficient but Statement I alone is not

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