Blood relations – identity of self vs sibling: Pointing to a girl, Nidhi said, "She is the only daughter of my grandmother's only child." How is the girl related to Nidhi?
Correct Answer: Self
Introduction / Context:This tests recognition that "grandmother's only child" must be Nidhi's parent, and "only daughter" of that parent uniquely identifies Nidhi herself if she is female.
Given Data / Assumptions:
- Grandmother has exactly one child ⇒ Nidhi's parent.
- The referenced girl is the only daughter of that parent.
- Nidhi is female (typical name-based assumption used in such puzzles).
Concept / Approach:If a parent has only one daughter and Nidhi is a daughter of that parent, then Nidhi herself is that "only daughter." Therefore the girl being pointed at is Nidhi (i.e., the relation is "Self").
Step-by-Step Solution:
Grandmother → only child = parent of Nidhi.Only daughter of that parent = unique female child.Given Nidhi is that daughter ⇒ the girl is Nidhi (Self).Verification / Alternative check:If there were any other daughter, "only daughter" would be contradicted. If Nidhi were not the daughter, she would not call the person "my grandmother's only child" her parent.
Why Other Options Are Wrong:Sister/Cousin/Aunt introduce extra daughters or other branches, violating "only daughter."
Common Pitfalls:Overlooking the exclusivity implied by "only."
Final Answer:Self