Which of the following pairs of sets is equal?
A{4, 8, 12, 16} and {8, 4, 16, 18}
B{2, 4, 6, 8, 10} and {x : x is a positive even integer and x ≤ 10}
C{x : x is a multiple of 10} and {10, 15, 20, 25, 30, …}
D{a, b, c, d} and {d, c, b, a, e}
Answer & Solution
Correct answer: B. {2, 4, 6, 8, 10} and {x : x is a positive even integer and x ≤ 10}
Two sets are equal iff they have exactly the same elements (order/repetition immaterial). Only option C names the same six elements on both sides; the others differ by at least one element.
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