यदि (n\(A\cup B\)=54), (n\(A\setminus B\)=17) और (n\(B\setminus A\)=21) है, तो (n\(A\cap B\)) क्या है?
If (n\(A\cup B\)=54), (n\(A\setminus B\)=17) and (n\(B\setminus A\)=21), what is (n\(A\cap B\))?
Explanation opens after your attempt
Correct Answer
A. (16)
Concept
\(A\cup B\) is made of three separate parts, so (54=17+21+n\(A\cap B\)). Hence (n\(A\cap B\)=16), add Venn regions carefully.
Why this answer is correct
The correct answer is A. (16). \(A\cup B\) is made of three separate parts, so (54=17+21+n\(A\cap B\)). Hence (n\(A\cap B\)=16), add Venn regions carefully.
Exam Tip
\(A\cup B\) तीन अलग भागों से बनता है, इसलिए (54=17+21+n\(A\cap B\))। अतः (n\(A\cap B\)=16), वेन आरेख में क्षेत्रों को जोड़ें।
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