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Which of the following is not a singleton set? \[\] (A) { x : |x| = 5, x $ \in $ N } (B) { x : |x| = 6, x $ \in $ Z } \[\] (C) { x : $x^2$ + 2x + 1 = 0, x $\in$ N } (D) { x : $x^2$ = 7, x $\in$ N }

1 Answer

B,C and D
Hence (C) is the correct answer.
answered Jun 12, 2014 by thanvigandhi_1
 

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