alleryএকটি হোস্টেলে 60 জন শিক্ষার্থী Daily A পড়ে, 50 জন Daily B পড়ে এবং 20 জন উভয়টিই পড়ে। কতজন কেবলমাত্র Daily A পড়ে?
A20
B30
C35
D40
Answer & Solution
Correct answer: D. 40
কেবলমাত্র Daily A = n(A) - n(A ∩ B) = 60 - 20 = 40।
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