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Question: How is M related to N?
Statement I: M is the only son of N's father.
Statement II: N is a girl.
Which statement(s) 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

From I, M is the only son of N's father, so N (a different person) must be a daughter of that father: M is N's brother. I alone answers it. II alone says nothing about M.
Answer: A) Statement I alone is sufficient but Statement II alone is not

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