allery60 জন ব্যক্তির একটি দলে, 35 জন চা পছন্দ করেন, 30 জন কফি পছন্দ করেন এবং 10 জন কোনোটিই পছন্দ করেন না। কতজন উভয়ই পছন্দ করেন?
A25
B10
C15
D20
Answer & Solution
Correct answer: C. 15
50 জন ব্যক্তি অন্তত একটি পানীয় পছন্দ করেন, সুতরাং উভয়ই = 35 + 30 - 50 = 15।
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