A. at L+
Added by George K.
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In this context, "L+" could refer to a positive change or improvement in the variable or situation being discussed. Show more…
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If $N=\{1,2,3, \ldots\}$ is the set of natural numbers, and given that $$ \begin{aligned} & X=\{x: x \in N \text { and } x \text { even }\} \\ & Y=\{x: x \in N \text { and } x \text { divisible by } 3\} \\ & Z=\{x: x \in N \text { and } 9<x \leq 20\} \end{aligned} $$ find the set $X \cap(Y \cup Z)$.
If $X=\{2,6,10,14,18\}, \quad Y=\{1,5,9,13,17\}$, $Z=\{1,2,5,7,10,13,18\}$, find $Y \cup(X \cap Z)$ and $(Y \cap X) \cup Z$
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