यदि (A) में (n) तत्व हैं और (\mathcal{P}(A)) में (31) proper subsets हैं, तो (n) कितना है?
If (A) has (n) elements and (\mathcal{P}(A)) has (31) proper subsets, what is (n)?
Explanation opens after your attempt
B. (5)
Concept
The number of proper subsets is \(2^n-1=31\). Therefore \(2^n=32\) and (n=5).
Why this answer is correct
The correct answer is B. (5). The number of proper subsets is \(2^n-1=31\). Therefore \(2^n=32\) and (n=5).
Exam Tip
Proper subsets की संख्या \(2^n-1=31\) है। इसलिए \(2^n=32\) और (n=5)।
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