If D is the brother of B, how B is related to C? To answer this question which…
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If D is the brother of B, how B is related to C? To answer this question which of the statements is/are necessary?
1. The son of D is the grandson of C.
2. B is the sister of D.
- A.
Only 1
- B.
Only 2
- C.
Either 1 or 2
- D.
1 and 2 both are required
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Correct answer: D
Answer: Both statements together are required.
Given: D is the brother of B. This means D is male and B is his sibling.
Statement 1: The son of D is the grandson of C. Hence D is a child of C (D is a son of C).
Alone, this tells us that B is also a child of C (as a sibling of D) but does not tell us B's gender, so you cannot conclude whether B is the daughter of C.
Statement 2: B is the sister of D.
Alone, this only gives B's gender and sibling relation to D; it does not provide any link between B (or D) and C.
Combining both statements: D is a child of C (from statement 1) and B is a female sibling of D (from statement 2). Therefore B is a female child of C, i.e., B is the daughter of C.