allery50 জনের একটি শ্রেণীতে, 30 জন গণিত পড়ে, 25 জন বিজ্ঞান পড়ে এবং 15 জন উভয় বিষয়ই পড়ে। কতজন কোনোটিই পড়ে না?
A5
B12
C10
D8
Answer & Solution
Correct answer: C. 10
Union = 30 + 25 - 15 = 40 জন শিক্ষার্থী, সুতরাং 50 - 40 = 10 জন কোনোটিই পড়ে না।
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