यदि \(A\subseteq B\), (n(A)=18) और (n(B)=45) है, तो (n(B-A)) कितना होगा?
If \(A\subseteq B\), (n(A)=18), and (n(B)=45), what is (n(B-A))?
Explanation opens after your attempt
Correct Answer
A. (27)
Concept
When \(A\subseteq B\), all of (A) lies inside (B), so (45-18=27). In a subset Venn diagram, the smaller circle is inside the larger one.
Why this answer is correct
The correct answer is A. (27). When \(A\subseteq B\), all of (A) lies inside (B), so (45-18=27). In a subset Venn diagram, the smaller circle is inside the larger one.
Exam Tip
जब \(A\subseteq B\), तब (A) पूरा (B) के अंदर होता है, इसलिए (45-18=27)। उपसमुच्चय वाले वेन आरेख में छोटा वृत्त बड़े के अंदर बनता है।
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