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Question

Which of the following is a singleton set?

A
{x: x = 0}
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B
{x: x < 6}
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C
{x: 2< x <7}
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D
{x: x < -2}
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Solution

The correct option is A {x: x = 0}
{x: x = 0} = {0}, it has only one element in it. Therefore, option A is a singleton set.

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