alleryہاسٹل میں، 60 طلباء روزانہ A، 50 روزانہ B، اور 20 دونوں پڑھتے ہیں۔ کتنے لوگ صرف روزانہ A پڑھتے ہیں؟
A20
B30
C35
D40
Answer & Solution
Correct answer: D. 40
صرف روزانہ A = n(A) - n(A ∩ B) = 60 - 20 = 40۔
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