1.

Which of the following is a singleton set ?A. {0}B. `{phi}`C. { xx is an even prime number }D. All of these

Answer» Correct Answer - D
{0} contains one elements is ( d)
`{phi}`contains one elements i.e `phi`
{x: x is an even prime number }={2} contains one element , I,e 2.
`therefore` All of the above are singleton sets .
Hence , the correct option is ( d)


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