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Q.

Among the following, a singleton set is

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a

${x : | x | < 1, x \in z}$

b

${x : | x | = 5, x \in z}$

c

${x : x^{2} = 1, x \in z}$

d

${x : x^{2} + x + 1 = 0, x \in R}$

answer is A.

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Detailed Solution

A) ${x : | x | < 1, x \in Z} = {0}$

B) ${x : | x | = 5} = {- 5, 5}$

C) ${- 1, 1}$

D) ${}$

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