allery70 জন ব্যক্তির একটি দলে 40 জন চা পান করেন, 35 জন কফি পান করেন এবং 15 জন কোনোটিই পান করেন না। কতজন উভয়ই পান করেন?
A10
B15
C20
D25
Answer & Solution
Correct answer: C. 20
Union = 70 - 15 = 55। উভয়ই পান করেন = 40 + 35 - 55 = 20।
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