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UPSC Prelims 2023CSATLogical ReasoningBlood Relations

Q9. Consider the following including the Question and the Statements: There are 5 members A, B, C, D, E in a family. Question: What is the relation of E to B ? Statement-1: A and B are a married couple. Statement-2: D is the father of C. Statement-3: E is D's son. Statement-4: A and C are sisters.

Which one of the following is correct in respect of the above Questions and Statements?

A. Statement-1, Statement-2 and Statement-3 are sufficient to answer the Question.
B. Statement-1, Statement-3 and Statement-4 are sufficient to answer the Question.
C. All four statement together are sufficient to answer the Question.✓ Correct
D. All four statements are not sufficient to answer the Question.

Detailed Solution

✓ Correct Answer: Option C

Let's deduce the relationships using all statements: 1. A and B are a married couple. 2. D is the father of C. 3. E is D's son. 4. A and C are sisters. From (2) and (3), D is the father of both C and E, making C and E siblings.

From (4), A and C are sisters. This means A is also D's daughter. Since A is D's daughter and E is D's son, A and E are siblings. From (1), A and B are a married couple. If A is female (sister of C), then B must be her husband.

Since E is A's brother, E is B's brother-in-law. All four statements are necessary to establish these connections and determine the precise relationship between E and B.

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