alleryএটা হোষ্টেলত, 60 জন ছাত্ৰ-ছাত্ৰীয়ে দৈনিক বাতৰিকাকত A পঢ়ে, 50 জনে দৈনিক বাতৰিকাকত B পঢ়ে আৰু 20 জনে দুয়োখন পঢ়ে। কিমানজনে কেৱল দৈনিক বাতৰিকাকত A পঢ়ে?
A20
B30
C35
D40
Answer & Solution
Correct answer: D. 40
Only Daily A = n(A) - n(A ∩ B) = 60 - 20 = 40।
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