एक सर्वेक्षण में (45) लोग (A), (50) लोग (B), (42) लोग (C), (18) लोग \(A\cap B\), (20) लोग \(B\cap C\), (16) लोग \(C\cap A\), और (7) लोग तीनों में हैं। केवल (A) में कितने लोग हैं?
In a survey, (45) people are in (A), (50) in (B), (42) in (C), (18) in \(A\cap B\), (20) in \(B\cap C\), (16) in \(C\cap A\), and (7) in all three. How many people are only in (A)?
Explanation opens after your attempt
A. (18)
Concept
Only (A=45-(18-7)-(16-7)-7=18). Separate the triple part from pairwise intersections before subtracting.
Why this answer is correct
The correct answer is A. (18). Only (A=45-(18-7)-(16-7)-7=18). Separate the triple part from pairwise intersections before subtracting.
Exam Tip
केवल (A=45-(18-7)-(16-7)-7=18)। युग्म छेदनों से त्रिक भाग अलग करके घटाएं।
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