allery80 জন ব্যক্তির একটি সমীক্ষায় 45 জন চা পান করেন, 35 জন কফি পান করেন এবং 10 জন উভয়ই পান করেন। কতজন কেবল কফি পান করেন?
A15
B20
C25
D35
Answer & Solution
Correct answer: C. 25
কেবল কফি = n(Coffee) - n(Tea ∩ Coffee) = 35 - 10 = 25।
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