If 'All college professors are entertaining lecturers' is True in a square of opposition, which of the following can be inferred correctly from the given codes?
(A) 'No college professors are entertaining lecturers' is false
(B) 'Some college professors are not entertaining lecturers' is true
(C) 'Some college professors are entertaining lecturers' is true
(D) 'Some college professors are entertaining lecturers' is false
Choose the correct answer from the options given below:यदि विरोध-वर्ग (square of opposition) में 'सभी कॉलेज प्राध्यापक मनोरंजक व्याख्याता हैं' सत्य है, तो दिए गए कूटों में से निम्नलिखित में से कौन-सा सही निगमित किया जा सकता है?
(A) 'कोई कॉलेज प्राध्यापक मनोरंजक व्याख्याता नहीं है' — असत्य है
(B) 'कुछ कॉलेज प्राध्यापक मनोरंजक व्याख्याता नहीं हैं' — सत्य है
(C) 'कुछ कॉलेज प्राध्यापक मनोरंजक व्याख्याता हैं' — सत्य है
(D) 'कुछ कॉलेज प्राध्यापक मनोरंजक व्याख्याता हैं' — असत्य है
नीचे दिए गए विकल्पों में से सही उत्तर चुनिए:
Pick an option to check yourself, or open the answer below.
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Correct answer: D. (A) and (C) onlyकेवल (A) और (C)
Explanation
The given proposition is an A proposition and it is true. Its contrary E ('No college professors are entertaining lecturers') must then be false, so (A) is correct. Its contradictory O ('Some college professors are not entertaining lecturers') must be false, so (B) is wrong. Its subaltern I ('Some college professors are entertaining lecturers') must be true, so (C) is correct and (D) is wrong. Hence (A) and (C) only.दिया गया कथन A-प्रतिज्ञप्ति है और सत्य है। इसका विरोधी (contrary) E कथन ('कोई कॉलेज प्राध्यापक मनोरंजक व्याख्याता नहीं है') अवश्य असत्य होगा, अतः (A) सही है। इसका व्याघाती (contradictory) O कथन ('कुछ कॉलेज प्राध्यापक मनोरंजक व्याख्याता नहीं हैं') असत्य होगा, अतः (B) ग़लत है। इसका अधीन (subaltern) I कथन ('कुछ कॉलेज प्राध्यापक मनोरंजक व्याख्याता हैं') अवश्य सत्य होगा, अतः (C) सही तथा (D) ग़लत है। अतः उत्तर केवल (A) और (C)।More Logical Reasoning questions
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