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सभी यूनिकॉर्न उड़ सकते हैं। चार्ली एक यूनिकॉर्न है। अतः चार्ली उड़ सकता है। यह तर्क:

Aऔपचारिक रूप से अमान्य है
Bआत्म-विरोधाभासी है
Cकेवल आगमनात्मक है
Dऔपचारिक रूप से मान्य है
Answer & Solution
Correct answer: D. औपचारिक रूप से मान्य है
निष्कर्ष केवल तार्किक संरचना के आधार पर ही आधार-वाक्यों से निकलता है, भले ही यूनिकॉर्न का वास्तविक अस्तित्व हो या न हो।
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