list all subsets of {1,2}

Question

akashdeepdeb · Answer

WELCOME TO OPENSTUDY!! :D

akashdeepdeb · Answer

All subsets have the set and null set in them.

 Subsets of {1,2} then would be..

{1},{2},{1,2},()

Understood this? :)

anonymous · Answer

Should subset {2,1} be included? Book shows it is....why?

goformit100 · Answer

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asnaseer · Answer

if you have two subsets A and B, the B would be a subset of A if every member of B is also a member of A.

agreed?

anonymous · Answer

0 is an element
$$But null set expressed as \left\{  \right\} or \phi $$ is a subset of every set.

anonymous · Answer

$$\left\{ 1,2 \right\} and \left\{ 2,1 \right\} are same.$$