alleryযদি সেট A-তে 18 জন সদস্য থাকে, সেট B-তে 12 জন থাকে এবং A ও B-এর মধ্যে 5 জন সাধারণ সদস্য থাকে, তবে সংযোগে (ইউনিয়নে) কতজন সদস্য রয়েছে?
A20
B25
C35
D30
Answer & Solution
Correct answer: B. 25
ইউনিয়ন = 18 + 12 - 5 = 25, কারণ সাধারণ সদস্যদের কেবল একবার গণনা করতে হবে।
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