Q. If $A \subseteq B$ , then $B^{'} - A^{'}$ is equal to

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A

$A^{'}$

18%

B

$B^{'}$

26%

C

$A - B$

22%

D

$ϕ$

34%

Solution:

$x \in B^{'}$
$\Rightarrow x \in / B$
$\Rightarrow x \in / A$
$\Rightarrow x \in A^{'}$
$\Rightarrow B^{'} \subseteq A^{'}$
$\Rightarrow B^{'} - A^{'} = ϕ$