alleryଏକ ହଷ୍ଟେଲରେ, 60 ଜଣ ଛାତ୍ରଛାତ୍ରୀ ଦୈନିକ A ପଢ଼ନ୍ତି, 50 ଜଣ ଦୈନିକ B ପଢ଼ନ୍ତି ଏବଂ 20 ଜଣ ଉଭୟ ପଢ଼ନ୍ତି। କେତେ ଜଣ କେବଳ ଦୈନିକ A ପଢ଼ନ୍ତି?
A20
B30
C35
D40
Answer & Solution
Correct answer: D. 40
କେବଳ Daily A = n(A) - n(A ∩ B) = 60 - 20 = 40.
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