तीन समुच्चयों में (n\(A\cap B\)=31), (n\(B\cap C\)=29), (n\(C\cap A\)=25) और (n\(A\cap B\cap C\)=12) है। ठीक दो समुच्चयों में आने वाले तत्व कितने हैं?
In three sets (n\(A\cap B\)=31), (n\(B\cap C\)=29), (n\(C\cap A\)=25), and (n\(A\cap B\cap C\)=12). How many elements are in exactly two sets?
Explanation opens after your attempt
A. (49)
Concept
Exactly two (=(31-12)+(29-12)+(25-12)=49). Each pairwise intersection includes the central part, so subtract it.
Why this answer is correct
The correct answer is A. (49). Exactly two (=(31-12)+(29-12)+(25-12)=49). Each pairwise intersection includes the central part, so subtract it.
Exam Tip
ठीक दो (=(31-12)+(29-12)+(25-12)=49) है। प्रत्येक जोड़ी में केंद्रीय भाग शामिल होता है, इसलिए उसे घटाएं।
Login to save your score, XP, coins and progress.
