allery80 व्यक्तियों के एक सर्वेक्षण में, 45 चाय पीते हैं, 35 कॉफी पीते हैं, और 10 दोनों पीते हैं। कितने व्यक्ति केवल कॉफी पीते हैं?
A15
B20
C25
D35
Answer & Solution
Correct answer: C. 25
केवल कॉफी = n(Coffee) - n(Tea ∩ Coffee) = 35 - 10 = 25।
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