Decide whether each pair of sets is equal. Justify your answer.
a. {1, 3, 5, 7, 9} and {9, 7, 5, 3, 1}
b. {2, 3, 4, 5, 4, 6, 4, 7, 8, 9, 10, 9, 11, 12} and {2, 3, 4, …;, 12}
c. {2, 4, 6, 8, …;} and {2, 4, 6, …;, 1,000}
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