allery70 व्यक्तियों के एक समूह में, 40 पत्रिका P पढ़ते हैं, 30 पत्रिका Q पढ़ते हैं और 10 दोनों पत्रिकाएं पढ़ते हैं। केवल एक ही पत्रिका पढ़ने वाले व्यक्तियों की संख्या कितनी है?
A55
B50
C40
D45
Answer & Solution
Correct answer: B. 50
केवल एक = (40 - 10) + (30 - 10) = 50.
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