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Which of the following sets are singleton sets?  $i) A = { x : 3x – 2 = 0, x \in Q } \quad ii) B = { x : x^3$ = 0, x \in $R } \quad iii) C = { x : 30x - 59 = 0, x \in N }\quad iv) D = { x : |x| = 1, x$ \in Z }\$

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