Which of the following pairs of sets are not equal?
(A) `A={1,3,3,1}, B={1,4}`
(B) `A={x: x+2=2}, B={0}`
(C) `A={1,3,4}, B={3,1,4}`
(D) `A={1, 1/2, 1/3,...}, B={1/n : n in N}`
ANSWER : A