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1.Set Theory
medium
माना $n(U) = 700,\,n(A) = 200,\,n(B) = 300$ तथा $n(A \cap B) = 100,$ तब $n({A^c} \cap {B^c}) = $
A
$400$
B
$600$
C
$300$
D
$200$
Solution
$n({A^c} \cap {B^c})$ $= n[(A B)c] = $$n(U) – n(A \cup B)$$ = $$n(U) – [n(A) + n(B) – n(A \cap B)]$ $= 700 -[200 + 300 -100] = 300.$
Standard 11
Mathematics