allery45 জন শিক্ষার্থীর একটি ক্লাসে 25 জন ইতিহাস পড়ে, 20 জন ভূগোল পড়ে এবং 5 জন কোনোটিই পড়ে না। কতজন উভয় বিষয়ই পড়ে?
A15
B10
C5
D0
Answer & Solution
Correct answer: C. 5
Union = 45 - 5 = 40। উভয় বিষয় = 25 + 20 - 40 = 5।
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