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UPSC 2006: P, Q, R, S and T reside in a 5-storeyed (Ground + 4) building, and each of them resides on a separate floor. Further, 1. T does not reside on the topmost floor. 2. Q does not reside on the ground floor. 3. S resides on one storey above that of P and one storey below that of R. To know as to which of the 5 persons resides on the ground floor which of the above statements are sufficient / insufficient?
(a)1 and 3 are sufficient
(b)2 and 3 are sufficient
(c)1, 2 and 3 are sufficient
(d)1, 2 & 3 are insufficient
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Not attemptedCorrect Answer: (d) 1, 2 & 3 are insufficient
Using statement 3, the three consecutive floors must be (P,S,R) in either (0-1-2), (1-2-3) or (2-3-4). Adding statements 1 and 2 still leaves two valid arrangements: (P0,S1,R2,T3,Q4) where P is on the ground floor, and (T0,Q1,P2,S3,R4) where T is on the ground floor. Because more than one person can occupy the ground floor, even all three statements together are insufficient; hence option (d) is correct.
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Frequently Asked Questions
What is the correct answer to this UPSC 2006 Science & Technology question?▼
The correct answer is option (d): 1, 2 & 3 are insufficient. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Logical Reasoning & Puzzles question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2006, GS Paper 1, as Question 61. It falls under Science & Technology > Logical Reasoning & Puzzles.
What is the difficulty level of this UPSC question?▼
This question is rated "moderate". It requires sound conceptual understanding of the topic.
How many UPSC Prelims questions have been asked from Logical Reasoning & Puzzles?▼
UPSC has asked 71 questions from Logical Reasoning & Puzzles (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.