UPSC CSE 2025 · PYQ · Blood Relations / Data Sufficiency · medium
A question is given followed by two Statements I and II. Consider the Question and the Statements and mark the correct option.
Question: How is Q related to P?
Statement I: P has two sisters, R and S.
Statement II: R's father is the brother of Q.
Which one of the following is correct in respect of the above Question and the Statements?
A.The Question can be answered by using one of the Statements alone, but cannot be answered using the other statement alone.
B.The Question can be answered by using either Statement alone.
C.The Question can be answered by using both the Statements together, but cannot be answered using either Statement alone.✓ Correct
D.The Question cannot be answered even using any of the Statements.
Explanation
Statement I alone tells us R and S are sisters of P but says nothing about Q. Statement II alone tells us R's father is the brother of Q, but we don't know R's relation to P. Combining: R is P's sister (from I), so R's father is P's father. From II, R's father is Q's brother, so P's father is Q's brother — making Q the uncle/aunt (paternal uncle/aunt) of P. However, gender of Q isn't determined, so Q is paternal uncle or aunt. Both statements together establish the relationship. Option (c) is correct.
💡 Practice unlimited UPSC CSE PYQs + AI-tracked progress on each topic. Sign up free →
Want more UPSC CSE practice?
Free daily 10-Q quiz · adaptive mocks · 4,000+ verified PYQs · AI doubt solver in Hindi + English