यदि (U) में (n) अवयव हैं और (A) में (r) अवयव हैं, तो (A') में कितने अवयव होंगे?
If (U) has (n) elements and (A) has (r) elements, how many elements are in (A')?
Explanation opens after your attempt
Correct Answer
B. (n-r)
Concept
The complement contains elements of (U) not in (A), so the number is (n-r). Use this formula only when \(A\subseteq U\).
Why this answer is correct
The correct answer is B. (n-r). The complement contains elements of (U) not in (A), so the number is (n-r). Use this formula only when \(A\subseteq U\).
Exam Tip
पूरक में (U) के वे अवयव हैं जो (A) में नहीं हैं, इसलिए संख्या (n-r) है। यह सूत्र तभी लागू करें जब \(A\subseteq U\) हो।
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