P is the brother of Q; S is the daughter of Q; T is the sister of S; R is the mother of Q. Which statement(s) are correct? (1) R is the grandmother of S. (2) P is the uncle of S and T. (3) R has only one son. (4) Q has only one daughter.
Options:
(A) Both (1) and (2) are true.
(B) Both (1) and (3) are true.
(C) Only (3) is true.
(D) Only (4) is true.
Official Answer Key:
A
Step-by-Step Solution & Explanation
R (mother of Q) is grandmother of Q's children S and T → (1) true. P, being Q's brother, is uncle of S and T → (2) true. Nothing in the data restricts R to only one son (Q could have other siblings) or Q to only one daughter (S and T are both daughters of Q, and there could be more) — so (3) and (4) are not established. Hence only (1) and (2) are definitely true.
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