allery60 व्यक्तियों के एक समूह में, 35 चाय पसंद करते हैं, 30 कॉफी पसंद करते हैं और 10 इनमें से कुछ भी पसंद नहीं करते हैं। दोनों पसंद करने वाले व्यक्तियों की संख्या कितनी है?
A25
B10
C15
D20
Answer & Solution
Correct answer: C. 15
50 व्यक्ति कम से कम एक पेय पसंद करते हैं, इसलिए दोनों पसंद करने वाले = 35 + 30 - 50 = 15.
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