What is the union of the two sets a=(1,5,8,12,17} and b={5,17}? a) {1,5,17} b) {1,5,8,12,17} c) {5,27} d) {17}

A union of two sets is defined as the set of numbers included in set a, set b, or both, so the answer to this would be B, as this embodies the definition.
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The answer is, the streetlight is 18 inches tall.