[Small123]

I'm a bit stuck with the following question.

2. Let B,C,D,E be the following sets:

B={x|x is a real number, },

C={x|x is a real number, },

D={x|},

E={1}.

Which pair of these sets has the property that neither is contained in the other.

From my understanding D is the empty set and since the empty set is a subset of all the sets this cannot be one of the sets in the pair. and and . Thus there is no pair of sets for which neither is contained in the other.

I'm confused.

Apologies, I have just realised this is in the wrong forum.

[inspired.]

I believe that the correct solution is D and E, because 0 is an integer, so D is not the empty set.

[Small123]

(Original post by inspired.)
I believe that the correct solution is D and E, because 0 is an integer, so D is not the empty set.

Ohhhh, I see. Thanks for that .