UPSC Prelims 2009 · General Studies
Question 103: Logical Reasoning and Mental Ability
There is a family of 6 persons A, B, C, D, E and F. There are two married couples in the family. The family members are lawyer, teacher, salesman, engineer, accountant and doctor. D, the salesman is married to the lady teacher. The doctor is married to the lawyer. F, the accountant is the son of B and brother of E. C, the lawyer is the daughter-in-law of A. E is the unmarried engineer. A is the grandmother of F. How is E related to F?
AnswerThe answer is (d).
A is the grandmother, so a woman. D, the salesman, is married to the lady teacher, who can only be A, since the other couple is the doctor and the lawyer C. So A is the teacher, D her husband, B the doctor and C the lawyer is B's wife. F and E are B's children, and E is the unmarried engineer. E's sex is not given, so E could be F's brother or sister.
Why each option is right or wrong
- (a) E could be a brother, but the text does not say so.
- (b) E could be a sister, but the text does not say so.
- (c) E is F's sibling, not father.
- (d) Right: the sex of E is not given, so the relation cannot be fixed.
Explanation: written by UPSC Grade, not by UPSC.
Source: UPSC, Civil Services (Preliminary) Examination 2009, General Studies. UPSC's own paper isn't online; the words are from a published compilation. The paper on upsc.gov.in.