यदि \(A=\{1,2,3,4\}\) है, तो (\mathcal{P}(A)) में ऐसे members कितने हैं जो ({1,2}) से disjoint हैं?
If \(A=\{1,2,3,4\}\), how many members of (\mathcal{P}(A)) are disjoint from ({1,2})?
Explanation opens after your attempt
Correct Answer
B. (4)
Concept
Disjoint subsets are formed only from ({3,4}), so the number is \(2^2=4\). In exams, remove forbidden elements for a disjoint condition.
Why this answer is correct
The correct answer is B. (4). Disjoint subsets are formed only from ({3,4}), so the number is \(2^2=4\). In exams, remove forbidden elements for a disjoint condition.
Exam Tip
Disjoint subsets केवल ({3,4}) से बनेंगे, इसलिए संख्या \(2^2=4\) है। परीक्षा में disjoint condition के लिए forbidden elements हटाएं।
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