allery72 জন শিক্ষার্থীর মধ্যে 40 জন গান গায়, 32 জন নাচ করে এবং 12 জন উভয়টিই করে। কতজন এই দুটির মধ্যে অন্তত একটিতে অংশ নেয়?
A64
B60
C58
D66
Answer & Solution
Correct answer: B. 60
ইউনিয়ন = 40 + 32 - 12 = 60 জন শিক্ষার্থী।
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