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Question: Is X the brother of Y? Statement I: X is the son of Y's father. Statement II: Y is the daughter of X's mother, and X is male. Which statement(s) is/are sufficient to answer the question?

Competition practiceData Sufficiency
  • AStatement I alone is sufficient but Statement II alone is not
  • BStatement II alone is sufficient but Statement I alone is not
  • CBoth statements together are needed (neither alone is sufficient)
  • DEither statement alone is sufficient

Step-by-Step Solution

I: X (a son) shares Y's father, so X is Y's brother. II: Y is X's sister and X is male, so X is Y's brother. Each alone answers 'yes'.
Answer: D) Either statement alone is sufficient

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