तीन समुच्चयों में (n(A)=84), (n(B)=78), (n(C)=72), ठीक एक समुच्चय में (96) और तीनों में (12) हैं। ठीक दो समुच्चयों में कितने तत्व हैं?
In three sets (n(A)=84), (n(B)=78), (n(C)=72), (96) elements are in exactly one set, and (12) are in all three. How many elements are in exactly two sets?
Explanation opens after your attempt
B. (51)
Concept
Total memberships are (84+78+72=234). \(234=96+2x+3\times12\), so (x=51).
Why this answer is correct
The correct answer is B. (51). Total memberships are (84+78+72=234). \(234=96+2x+3\times12\), so (x=51).
Exam Tip
कुल सदस्यता (84+78+72=234) है। \(234=96+2x+3\times12\), इसलिए (x=51)।
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