Question

which of the following has only one subset
1.{ }. 2.{4}
3.{4,5}. 4.{0}​

Answer 1

1. { }

Subsets = { }

2. {4}

Subsets = { } , {4}

3. {4 , 5}

Subsets = { } , {4} , {5} , {4 , 5}

4. {0}

Subsets = { } , {0}

So, the answer is option 1. { } bcz,

it has only one subset.