तीन विषयों के सर्वे में (n(M)=60), (n(P)=54), (n(C)=50), (n\(M\cap P\)=25), (n\(P\cap C\)=22), (n\(C\cap M\)=20), (n\(M\cap P\cap C\)=10) है। केवल (M) पढ़ने वाले कितने हैं?
In a survey of three subjects (n(M)=60), (n(P)=54), (n(C)=50), (n\(M\cap P\)=25), (n\(P\cap C\)=22), (n\(C\cap M\)=20), (n\(M\cap P\cap C\)=10). How many study only (M)?
Explanation opens after your attempt
A. (25)
Concept
Only (M=60-25-20+10=25). In three sets, the centre is subtracted twice and must be added back.
Why this answer is correct
The correct answer is A. (25). Only (M=60-25-20+10=25). In three sets, the centre is subtracted twice and must be added back.
Exam Tip
केवल (M=60-25-20+10=25) है। तीन समुच्चयों में केंद्र को घटाने के बाद वापस जोड़ना पड़ता है।
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