allery80 لوگوں کے سروے میں، 45 چائے پیتے ہیں، 35 کافی پیتے ہیں، اور 10 دونوں پیتے ہیں۔ کتنے لوگ صرف کافی پیتے ہیں؟
A15
B20
C25
D35
Answer & Solution
Correct answer: C. 25
صرف کافی = n(کافی) - n(چائے ∩ کافی) = 35 - 10 = 25۔
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