Is G\K a subgroup if K has index 2 in G?

[Punkyc7]

Lets say I have a group of index 2 and I have some subgroup K. Is it that G\K is a subgroup as well?

 

[Dick]

Lets say I have a group of index 2 and I have some subgroup K. Is it that G\K is a subgroup as well?

That's not the sloppiest question I've ever seen posted but it's right up there. Can you rephrase that?

 

[Deveno]

elements of G/K are cosets gK, these are not elements of G unless K = {e}.