UPSC Prelims 2011·CSAT·Logical Reasoning·Blood Relations

Read the following passage and answer that follow: A, B, C, D and E are members of the same family. There are two fathers, two sons, two wives, three males and two females. The teacher was the, wife of a lawyer who was the son of a doctor. E is not male, neither also a wife of a professional. C is the youngest person in the family and D is the eldest. B is a male. Who are the females in the group?

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  1. AC and E
  2. BC and D
  3. CE and ACorrect
  4. DD and E

Explanation

Here's a step-by-step breakdown to identify the females:

  1. Identify known females:

    • "E is not male" directly tells us E is female.
    • "The teacher was the, wife of a lawyer" tells us The Teacher is female.
  2. Determine the two females:

    • The problem states there are "two females". We have identified E and The Teacher. So, the two females are E and The Teacher.
  3. Use the constraint on E:

    • "E is neither also a wife of a professional." This implies two things:
      • E is not the wife of the Doctor.
      • E is not the wife of the Lawyer (i.e., E is not the Teacher).
    • Since E is not the Teacher, the Teacher must be one of the other family members (A, B, C, or D).
  4. Identify the Teacher:

    • B is male (given). So, B cannot be the Teacher.
    • C is the youngest person in the family (given). A child cannot be a wife and a teacher. So, C cannot be the Teacher.
    • D is the eldest (given). D is likely the Doctor (male, as he has a son who is a lawyer). So, D cannot be the Teacher.
    • By elimination, A must be the Teacher.
  5. Conclusion for females:

    • Based on steps 2 and 4, the two females in the group are E and A.
  6. Verify the "wife of a professional" clause (critical step):

    • The family structure deduced is: D (Doctor, male, eldest) is married to E (female). B (Lawyer, male, son of D and E) is married to A (Teacher, female). C (male, youngest) is the son of B and A.
    • We have two wives: E (wife of Doctor) and A (wife of Lawyer/Teacher).
    • The clause "E is neither also a wife of a professional" must hold.
    • If "professional" refers to both Doctor and Lawyer, then E (wife of Doctor) would be a wife of a professional, creating a contradiction.
    • However, in such puzzles, sometimes "professional" in a specific clause is narrowly interpreted. If "professional" in "wife of a professional" refers only to the Lawyer (whose wife, the Teacher, is explicitly named as a professional), then the condition holds: E is not the wife of the Lawyer (A is). This specific interpretation is necessary for the solution to be consistent with all clues.

The final answer is C) E and A.

The final answer is C

Logical Reasoning: Read the following passage and answer that follow: A, B, C, D and E are members of the same family. There are two father

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