Which of the following is a singleton set ?
(A) \( \quad(x:|x|=5, x \in N) \)
(B) \( \quad(x:|x|... VIDEO
Which of the following is a singleton set ?
(A) \( \quad(x:|x|=5, x \in N) \)
(B) \( \quad(x:|x|=6, x \in Z) \)
(C) \( \quad\left(x: x^{2}+2 x+1=0, x \in N\right) \)
(D) \( \quad\left(x: x^{2}=7, x \in N\right) \)
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