If the statement "Some animals are not birds" is given as false, which of the following statements can be inferred to be true?
A. All animals are birds.
B. No birds are animals.
C. No animals are birds.
D. Some animals are birds.
Choose the correct answer from the options given below:यदि कथन "कुछ जानवर पक्षी नहीं होते हैं" को असत्य माना जाए तो निम्नलिखित में से कौन-से कथन सत्य माने जा सकते हैं?
A. सभी जानवर पक्षी होते हैं।
B. कोई पक्षी जानवर नहीं होता है।
C. कोई जानवर पक्षी नहीं होता है।
D. कुछ जानवर पक्षी होते हैं।
नीचे दिए गए विकल्पों में से सही उत्तर चुनिए:
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Correct answer: C. A and D Onlyकेवल A और D
Explanation
"Some animals are not birds" is the O proposition. Its contradictory is the A proposition "All animals are birds", so if O is false, A must be true. By subalternation, A true makes the I proposition "Some animals are birds" (D) true as well. Hence A and D Only."कुछ जानवर पक्षी नहीं होते" O कथन है। इसका विरोधाभासी (contradictory) A कथन "सभी जानवर पक्षी होते हैं" है, अतः O के असत्य होने पर A सत्य होगा। अंतर्भाव (subalternation) से A के सत्य होने पर I कथन "कुछ जानवर पक्षी होते हैं" (D) भी सत्य होगा। अतः केवल A और D।More Logical Reasoning questions
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