Answer
$X \cap Y=\{ 9\}$
Work Step by Step
We are given:
$X=\{1,3,5,7,9,11,13,15 \}$
$Y=\{2,6,9,10,16\}$
$Z=\{2,4,6,8,10,12,14,16,18\}$
$\rightarrow X \cap Y=\{ 9\}$
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