allery120 জনের একটি সমীক্ষায়, 70 জন আপেল এবং 50 জন আম পছন্দ করেন; 20 জন দুটিই পছন্দ করেন। কতজন কেবল আপেল পছন্দ করেন?
A50
B60
C30
D40
Answer & Solution
Correct answer: A. 50
কেবল আপেল = 70 - 20 = 50 জন, যাঁরা আপেলের বৃত্তে কিন্তু সাধারণ অংশের বাইরে রয়েছেন।
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