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Which of the following is a singleton s...

Which of the following is a singleton set ?

A

`{ x : x^(2) = 5 , x in Z}`

B

`{x : | x | = 2, x in N}`

C

`{x : |x| = 7, x in Z}`

D

`{ x : x^(2) + 4 x + 4 = 0, x in Z}`

Text Solution

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The correct Answer is:
B, D
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