alleryসেট A-এর 15 জন সদস্য রয়েছে এবং এটি সম্পূর্ণরূপে সেট B-এর ভেতরে অবস্থিত, যার সদস্য সংখ্যা 25। A বা B-তে কতজন আছেন?
A40
B15
C25
D10
Answer & Solution
Correct answer: C. 25
A-এর প্রত্যেক সদস্য ইতিমধ্যেই B-তে রয়েছেন, তাই সংযোগটি কেবল B-এর 25 জন সদস্য।
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