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UPSC 2000: Examine the following relationships among members of a family of six persons A, B, C, D, E and F. I. The number of males equals that of females. II. A and E are sons of F. III. D is the mother of two, one boy and one girl. IV. B is the son of A. V. There is only one married couple in the family at present. Which one of the following inferences can be drawn from the above?
(a)A, B and C are all females
(b)A is the husband of D
(c)E and F are children of D
(d)D is the grand-daughter of F
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Not attemptedCorrect Answer: (c) E and F are children of D
Let F be male (only one married couple). A and E are F’s sons. D is mother of one boy and one girl, so D is female and must be F’s wife. Their two children must be A (boy) and C (girl). B is son of A, giving male–female balance (three each). Therefore E and F are D’s children, making option (c) the only possible inference; (b) is wrong because A is D’s son, not husband. ([licchavilyceum.com](https://licchavilyceum.com/upsc-civil-services-prelims-2000-solved-question-paper/))
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What is the correct answer to this UPSC 2000 Science & Technology question?▼
The correct answer is option (c): E and F are children of D. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Logical Reasoning & Puzzles question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2000, GS Paper 1, as Question 135. It falls under Science & Technology > Logical Reasoning & Puzzles.
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This question is rated "difficult". It is a challenging question that demands deep subject knowledge and analytical thinking.
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UPSC has asked 71 questions from Logical Reasoning & Puzzles (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.