A is the father of B. B is the sister of C. C is the daughter of D. Which statement must be true?
Correct answer: A. A and D are married or are the parents of the same children
- A. A and D are married or are the parents of the same children
- B. A is the brother of D
- C. C is the son of A
- D. B and D are siblings
Explanation
B and C are sisters and daughters of the same family, so A as the father and D as the other parent must be the parents of both. C being a daughter rules out the third option. Nothing in the clues makes A and D siblings, and B is a child of D rather than a sibling.
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About Logical Deductions
Logical deductions require conclusions to be drawn from stated facts, conditions and relationships without adding outside information. The work includes handling all, some and none statements, necessary and sufficient conditions, ordering restrictions, true or false conclusions, and the difference between what must be true and what could be true.
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