यदि (n(A)=16), (n(B)=13) और (n\(A\cup B\)=21) है, तो (n\(A\cap B\)) कितना है?
If (n(A)=16), (n(B)=13), and (n\(A\cup B\)=21), what is (n\(A\cap B\))?
Explanation opens after your attempt
C. (8)
Concept
Using the formula, (n\(A\cap B\)=16+13-21=8). The common part is counted twice in the union formula, so it is subtracted.
Why this answer is correct
The correct answer is C. (8). Using the formula, (n\(A\cap B\)=16+13-21=8). The common part is counted twice in the union formula, so it is subtracted.
Exam Tip
सूत्र से (n\(A\cap B\)=16+13-21=8) होगा। संघ के सूत्र में सामान्य भाग दो बार गिना जाता है, इसलिए उसे घटाया जाता है।
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