UPSC CSE Prelims
Syllogism Previous Year Questions (PYQs)
Practice solved questions for Syllogism with detailed step-by-step solutions, key insights, and trend analysis for UPSC CSE PRELIMS.
Solved Previous Year Questions
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Consider the following statements: Every red is blue. Every blue is green. Every green is yellow.
Which of the following statements denoted by P, Q and R are correct? P. Every blue is yellow. Q. Every red is green. R. Every red is yellow.
Select the answer using the code given below.
Detailed Explanation:
Chain of relationships: Red ⊂ Blue ⊂ Green ⊂ Yellow. Every red is blue, every blue is green, every green is yellow—this creates a transitive chain.
Statement P (Every blue is yellow): Blue ⊂ Green and Green ⊂ Yellow ⇒ Blue ⊂ Yellow. Correct.
Statement Q (Every red is green): Red ⊂ Blue and Blue ⊂ Green ⇒ Red ⊂ Green. Correct.
Statement R (Every red is yellow): Red ⊂ Blue ⊂ Green ⊂ Yellow ⇒ Red ⊂ Yellow. Correct.
Therefore, all three statements P, Q, and R are logically valid, making Option 4 the correct answer.
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