alleryএকটি লাইব্রেরিতে 90 জন সদস্য রয়েছে। 55 জন কথাসাহিত্য ধার নেন, 48 জন বিজ্ঞান ধার নেন এবং 13 জন কোনোটিই ধার নেন না। কতজন উভয় ধরনের বই-ই ধার নেন?
A22
B30
C26
D34
Answer & Solution
Correct answer: C. 26
77 জন সদস্য অন্তত এক ধরনের বই ধার নেন, সুতরাং ওভারল্যাপ হলো 55 + 48 - 77 = 26।
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