Answer
{$a;b;c;d;e;f;g$}
Work Step by Step
The union of two sets consists of the elements that are in the first set, in the second set or in both sets:
{$a;b;c;d;e$}}$\cup${$c;d;e;f;g$}$=${$a;b;c;d;e;f;g$}
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