Blood relations - definitely true statements
Question
P is the brother of Q and R. S is R's mother. T is P's father. How many of the following statements are definitely true? I. S and T are a couple II. Q is T's son III. T is Q's father IV. S is P's mother V. R is T's daughter. VI. P is S's son.
Options
Only two
Only three
Only four
Only five
Explanation
Map the family tree: Since P, Q, and R are siblings, they share the same parents. S is R's mother, so S is the mother of all three. T is P's father, so T is the father of all three. Therefore, S and T are a married couple. We also know P is male ("brother"), but the genders of Q and R are strictly unknown. Evaluate the statements: I. True (Shared parents). II. False/Uncertain (Q's gender is unknown). III. True (T is the father of all siblings). IV. True (S is the mother of all siblings). V. False/Uncertain (R's gender is unknown). VI. True (P is male, and S is his mother, so he is her son). Exactly four statements (I, III, IV, VI) are definitively true.
Answer: (c).
Question details
Year
2025
Paper
CSAT
Question
Q45
Section
Logical & Analytical Reasoning
Sub-topic
Blood Relations
Type
Blood relations
Difficulty
Medium
Source hint
Logical deduction
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