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UPSC 1997: Consider the following: I. Saxena, David, Jain and Kumar were District Collectors at places P, Q, R and S respectively in 1970. II. In 1972 they were transferred. Saxena and Jain interchanged places. Kumar and David also interchanged places. III. One year later in 1973 they were again transferred such that David and Jain interchanged places and Saxena and Kumar were also interchanged. What should be the next round of transfers so that all the four persons could have been posted at all the four places?
(a)Interchange Saxena and David as well as Jain and Kumar
(b)Interchange Saxena and Kumar as well as David and Jain
(c)Interchange David and Kumar as well as Saxena and Jain
(d)It is not possible for all the four persons to have been posted at all the four places
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Not attemptedCorrect Answer: (a) Interchange Saxena and David as well as Jain and Kumar
After the three given rounds (1970, 1972, 1973) each officer has served at two different places. To ensure that in the fourth move everyone gets a post they have not yet held, Saxena must go to David’s 1973 post and David to Saxena’s, while simultaneously Jain and Kumar swap their remaining unvisited posts. This is exactly the interchange in option (a); any other swap would leave at least one officer repeating a posting. ([scribd.com](https://www.scribd.com/document/731910044/1997))
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Frequently Asked Questions
What is the correct answer to this UPSC 1997 Science & Technology question?▼
The correct answer is option (a): Interchange Saxena and David as well as Jain and Kumar. 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 1997, GS Paper 1, as Question 143. 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.