यदि (n\(A\cup B\)=20), (n(A)=12) और (n(B)=11) है, तो (n\(A\cap B\)) कितना है?
If (n\(A\cup B\)=20), (n(A)=12), and (n(B)=11), what is (n\(A\cap B\))?
Explanation opens after your attempt
C. (3)
Concept
From the formula, (n\(A\cap B\)=12+11-20=3). When using the formula backward, subtract the union.
Why this answer is correct
The correct answer is C. (3). From the formula, (n\(A\cap B\)=12+11-20=3). When using the formula backward, subtract the union.
Exam Tip
सूत्र से (n\(A\cap B\)=12+11-20=3) है। उल्टा सूत्र लगाते समय संघ को घटाएं।
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