allery100 জন ব্যক্তির মধ্যে 70 জন চা পান করেন, 45 জন কফি পান করেন এবং সকলেই অন্তত একটি পান করেন। কতজন উভয়ই পান করেন?
A25
B10
C20
D15
Answer & Solution
Correct answer: D. 15
উভয়ই = 70 + 45 - 100 = 15, কারণ প্রত্যেকেই 100 জনের সংযোগের অন্তর্ভুক্ত।
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