allery50 জন শিক্ষার্থীর একটি শ্রেণীতে, 30 জন ক্রিকেট খেলে এবং 25 জন ফুটবল খেলে। 10 জন উভয় খেলাই খেলে। কতজন কোনো খেলাই খেলে না?
A5
B15
C20
D10
Answer & Solution
Correct answer: A. 5
অন্তত একটি খেলে (union) = 30 + 25 - 10 = 45। কোনোটিই খেলে না = 50 - 45 = 5।
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