allery100 জন শিক্ষার্থীর একটি দলে 60 জন ক্রিকেট খেলে, 50 জন ফুটবল খেলে এবং 20 জন উভয় খেলাই খেলে। কতজন কোনো খেলাই খেলে না?
A10
B20
C30
D40
Answer & Solution
Correct answer: A. 10
Union = n(C) + n(F) - n(C ∩ F) = 60 + 50 - 20 = 90। কোনো খেলা খেলে না এমন শিক্ষার্থী = 100 - 90 = 10।
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