Home›UPSC Prelims›Paper 2: General Studies II (CSAT)›Civil Services Aptitude Test (CSAT)›Logical Reasoning and Analytical Ability›P, Q, R, S, T and U are six members of a family. R is the spouse of

P, Q, R, S, T and U are six members of a family. R is the spouse of Q. U is the mother of T and S is the daughter of U. P's daughter is T and R's son is P. There are two couples in the family. Which one of the following is correct?

20223Mprelimsupscyear-2022p2logical-reasoningrelationship-puzzles
A.Q is the grandfather of T
B.Q is the grandmother of TCorrect
C.R is the mother of P
D.T is the granddaughter of Q
Explanation & Solution

Correct Option: Q is the grandmother of T

Let us deduce the family tree step by step: Members are P, Q, R, S, T, U. There are two couples. R is the spouse of Q. R's son is P, which means R and Q are the parents, and P is their son. P's daughter is T, so T is the daughter of P and granddaughter of R and Q. U is the mother of T. Since P is the father of T, U must be the wife of P, making P and U a married couple (the second couple). U's daughter is S, so S is also the daughter of P and U (making S and T siblings). The two couples are (R, Q) and (P, U). Since R is the spouse of Q and P is R's son, Q is either grandfather or grandmother. Since U is T's mother and P is T's father, Q is the parent of P. Therefore, Q is the grandmother of T (assuming Q is female, which aligns with 'grandmother' option). Let's check options: Q is the grandmother of T. Hence, option (b) is correct.

हिंदी में प्रश्न एवं आदर्श उत्तर

P, Q, R, S, T और U एक परिवार के छ: सदस्य हैं। Q का/की पति/पत्नी R है। T की माता U है और U की पुत्री S है। P की पुत्री T है और R का पुत्र P है। इस परिवार में दो दंपति हैं। निम्नलिखित में से कौन-सा एक सही है?

A.T का दादा/नाना Q है
B.T की दादी/नानी Q हैसही
C.P की माता R है
D.Q की प्रपौत्री/दौहत्री T है

सही उत्तर: T की दादी/नानी Q है

परिवार के सदस्यों का वृक्ष इस प्रकार बनता है: सदस्य P, Q, R, S, T, U हैं। R और Q पति-पत्नी हैं। R का पुत्र P है, जिसका अर्थ है कि R और Q माता-पिता हैं और P उनका पुत्र है। P की पुत्री T है। T की माता U है, अतः P और U पति-पत्नी हैं (दूसरा दंपति)। U की पुत्री S है, अतः S और T बहनें हैं। दोनों दंपति (R, Q) और (P, U) हैं। चूंकि P, R और Q का पुत्र है और T, P की पुत्री है, इसलिए Q, T की दादी/नानी होगी। अतः विकल्प (b) 'Q is the grandmother of T' सही है।

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