UPSC Prelims 2010 · General Studies
Question 78: Logical Reasoning and Mental Ability
In a group of five persons A, B, C, D and E, there is a professor, a doctor and lawyer. A and D are unmarried ladies, and do not work. Of the married couple in the Group, E is the husband. B is the brother of A and is neither a doctor nor a lawyer. Who is the professor ?
AnswerThe answer is (a).
A and D are unmarried women who do not work, so the professor, doctor and lawyer are among B, C and E. E is the husband in the married couple, and his wife must be C, because A and D are unmarried and B is A's brother. So B, C and E are the three professionals. B is neither a doctor nor a lawyer, so B is the professor. Remember: remove the non-working persons first.
Why each option is right or wrong
- (a) Right: B is left as the professor.
- (b) C is the wife and one of the doctor or lawyer.
- (c) A does not work, so cannot be the professor.
- (d) The data are enough to determine the professor.
Explanation: written by UPSC Grade, not by UPSC.
Source: UPSC, Civil Services (Preliminary) Examination 2010, General Studies, Series A. The paper on upsc.gov.in.