यदि (n(A)=13), (n(B)=17), और (n\(A\cap B\)=5), तो (n\(A\cup B\)) क्या है?
If (n(A)=13), (n(B)=17), and (n\(A\cap B\)=5), what is (n\(A\cup B\))?
Explanation opens after your attempt
A. (25)
Concept
The number in the union is (13+17-5=25). Subtract the common part once to avoid double counting.
Why this answer is correct
The correct answer is A. (25). The number in the union is (13+17-5=25). Subtract the common part once to avoid double counting.
Exam Tip
संघ की संख्या (13+17-5=25) है। साझा भाग को दो बार गिनने से बचने के लिए एक बार घटाएं।
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