यदि (n(A)=39), (n(B)=44) और ठीक एक समुच्चय में (51) तत्व हैं, तो (n\(A\cap B\)) कितना होगा?
If (n(A)=39), (n(B)=44), and (51) elements are in exactly one set, what is (n\(A\cap B\))?
Explanation opens after your attempt
B. (16)
Concept
Exactly one is (n(A)+n(B)-2n\(A\cap B\)). So (51=83-2x), giving (x=16).
Why this answer is correct
The correct answer is B. (16). Exactly one is (n(A)+n(B)-2n\(A\cap B\)). So (51=83-2x), giving (x=16).
Exam Tip
ठीक एक (n(A)+n(B)-2n\(A\cap B\)) होता है। इसलिए (51=83-2x), तो (x=16)।
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