alleryगाजर खाने वाला प्रत्येक व्यक्ति क्वार्टरबैक है। जॉन गाजर खाता है। इसलिए जॉन एक क्वार्टरबैक है। यह तर्क:
Aअमान्य लेकिन तर्कसंगत (sound) है
Bअमान्य और अतर्कसंगत (unsound) है
Cतर्कसंगत और मान्य है
Dमान्य लेकिन तर्कसंगत (sound) नहीं है
Answer & Solution
Correct answer: D. मान्य लेकिन तर्कसंगत (sound) नहीं है
निष्कर्ष आधार-वाक्यों से तार्किक रूप से निकलता है, लेकिन पहला आधार-वाक्य असत्य है, इसलिए यह तर्क 'sound' (ठोस/तर्कसंगत) नहीं है।
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