First slide

Operations on Sets

Question

$If sets A and B are disjoint sets, such that n (A \cup B) = 30 and n (A) = 14, then n (B) =$

Easy

Solution

$\begin{array}{l} A and B are disjoint \\ ∴ n (A \cup B) = n (A) + n (B) \\ \Rightarrow 30 = 14 + n (B) \\ \Rightarrow n (B) = 16 \end{array}$

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