यदि (n\(A\cup B\)=12), (n(A)=7) और (n(B)=8) है, तो (n\(A\cap B\)) कितना है?
If (n\(A\cup B\)=12), (n(A)=7), and (n(B)=8), what is (n\(A\cap B\))?
Explanation opens after your attempt
C. (3)
Concept
From the formula, (n\(A\cap B\)=7+8-12=3). Keep signs correct when using the union formula backward.
Why this answer is correct
The correct answer is C. (3). From the formula, (n\(A\cap B\)=7+8-12=3). Keep signs correct when using the union formula backward.
Exam Tip
सूत्र से (n\(A\cap B\)=7+8-12=3) होगा। संघ वाला सूत्र उल्टा लगाते समय चिन्ह सही रखें।
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