Which pairs of sets are equivalent?
a. {baseball, football, basketball, field hockey, volleyball} and {b, f, b, f, v}
b. {1, 3, 5, 7, 9, …;, 99} and {2, 4, 6, 8, 10, …;, 100}
c. {x : x is a letter in the word tulips} and {x : x is a letter in the word flower}
d. {Ø} and {0}
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