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UPSC 1996: Six roads lead to a country. They may be indicated by letters X, Y, Z and digits 1, 2, 3. When there is storm, Y is blocked. When there are floods X, 1 and 2 will be affected. When road 1 is blocked, Z also is blocked. At a time when there are floods and a storm also blows, which road(s) can be used?
(a)Z and 2
(b)Only Z
(c)Only 3
(d)Only Y
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Not attemptedCorrect Answer: (c) Only 3
Floods block roads X, 1 and 2, while a storm blocks Y. Because 1 is blocked, Z is also blocked by the given condition. This leaves only road 3 open; all other roads are closed, so option (c) ‘Only 3’ is correct. Options (a), (b) and (d) all include at least one road that is blocked under the stated conditions. ([scribd.com](https://www.scribd.com/document/731910047/1996))
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What is the correct answer to this UPSC 1996 Science & Technology question?▼
The correct answer is option (c): Only 3. 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 1996, GS Paper 1, as Question 139. 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.