alleryഒരു ഹോസ്റ്റലിൽ, 60 വിദ്യാർത്ഥികൾ ദിവസേന A, 50 വിദ്യാർത്ഥികൾ ദിവസേന B, 20 എന്നിവ രണ്ടും വായിക്കുന്നു. എത്ര പേർ ദിവസേന A മാത്രം വായിക്കുന്നു?
A20
B30
C35
D40
Answer & Solution
Correct answer: D. 40
ദിവസേന മാത്രം A = n(A) - n(A ∩ B) = 60 - 20 = 40.
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