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How is P related to Q? Statement I: P is the son of Q's mother. Statement II: Q is the only daughter of P's father. Which statement(s) is/are sufficient to answer the question?

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

Step-by-Step Solution

I: P is the son of Q's mother, so P (a male sibling) is Q's brother — sufficient. II only tells that Q is P's sister but leaves P's gender unknown, so the exact relation of P to Q is not fixed. Hence I alone suffices.
Answer: B) Statement I alone is sufficient but Statement II alone is not

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