एक सर्वेक्षण में (n(U)=120), (n(A)=72), (n(B)=65) और (n\(A\cap B\)=38) है। केवल (A) में कितने विद्यार्थी हैं?
In a survey, (n(U)=120), (n(A)=72), (n(B)=65), and (n\(A\cap B\)=38). How many students are only in (A)?
Explanation opens after your attempt
A. (34)
Concept
Only (A) is (n(A)-n\(A\cap B\)=72-38=34). In exams, subtract the common part first.
Why this answer is correct
The correct answer is A. (34). Only (A) is (n(A)-n\(A\cap B\)=72-38=34). In exams, subtract the common part first.
Exam Tip
केवल (A) के लिए (n(A)-n\(A\cap B\)=72-38=34)। परीक्षा में पहले साझा भाग घटाएं।
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