alleryতিনটি পৃথক দলের যথাক্রমে 20, 15 এবং 10 জন সদস্য রয়েছে এবং তাদের মধ্যে কোনো সাধারণ সদস্য নেই। তিনটি দল মিলিয়ে মোট কতজন রয়েছে?
A30
B40
C35
D45
Answer & Solution
Correct answer: D. 45
যেহেতু কোনো সাধারণ অংশ নেই, তাই ইউনিয়ন হলো একটি সাধারণ যোগফল: 20 + 15 + 10 = 45।
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