यदि \(A=\{1,2\}\) और \(B=\{2,3\}\) है, तो (\mathcal{P}\(A\cup B\)) में कितने proper subsets होंगे?
If \(A=\{1,2\}\) and \(B=\{2,3\}\), how many proper subsets are in (\mathcal{P}\(A\cup B\))?
Explanation opens after your attempt
Correct Answer
B. (7)
Concept
\(A\cup B={1,2,3}\), so total subsets are \(2^3=8\) and proper subsets are (8-1=7). In exams, do not forget to exclude the whole set.
Why this answer is correct
The correct answer is B. (7). \(A\cup B={1,2,3}\), so total subsets are \(2^3=8\) and proper subsets are (8-1=7). In exams, do not forget to exclude the whole set.
Exam Tip
\(A\cup B={1,2,3}\), इसलिए कुल subsets \(2^3=8\) और proper subsets (8-1=7) हैं। परीक्षा में पूरा समुच्चय हटाना न भूलें।
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