allery100 জন ছাত্ৰ-ছাত্ৰীৰ এটা দলত, 60 জনে ক্ৰিকেট খেলে, 50 জনে ফুটবল খেলে আৰু 20 জনে দুয়োটা খেলে। কিমানজনে এটাও খেল নেখেলে?
A10
B20
C30
D40
Answer & Solution
Correct answer: A. 10
Union = n(C) + n(F) - n(C ∩ F) = 60 + 50 - 20 = 90। এটাও খেল নখেলা ছাত্ৰ-ছাত্ৰী = 100 - 90 = 10।
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