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How many brothers does R have? Statement I: R's mother has exactly three children. Statement II: R has exactly two sisters. Which statement(s) is/are sufficient to answer?

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

Step-by-Step Solution

I gives the sibling count but not genders; II gives two sisters but not the total. Together, three children are R plus two sisters, so R has 0 brothers.
Answer: B) Both statements together are needed (neither alone is sufficient)

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