Given Set H:

You can find the number of subsets the set has by using this formula:

Where "n" is the number of elements the set has.
In this case:

Then:

By definition, given a set:

Its subsets are:

Therefore, in this case, you can determine that the possible subsets of the given set are:
![\lbrace4\rbrace,\lbrace3\rbrace,\lbrace6\rbrace,\lbrace5\rbrace,\lbrace4,3\rbrace,\lbrace4,6\rbrace,\lbrace4,5\rbrace,\lbrace3,6\rbrace,\lbrace3,5\rbrace,\lbrace6,5\rbrace,\lbrace4,3,6\rbrace,\lbrace3,6,5\rbrace,\lbrace4,6,5\rbrace,\lbrace4,3,5\rbrace,\lbrace4,3,6,5\rbrace,\lbrace\phi\rbrace]()
Hence, the answer is:
![\lbrace4\rbrace,\lbrace3\rbrace,\lbrace6\rbrace,\lbrace5\rbrace,\lbrace4,3\rbrace,\lbrace4,6\rbrace,\lbrace4,5\rbrace,\lbrace3,6\rbrace,\lbrace3,5\rbrace,\lbrace6,5\rbrace,\lbrace4,3,6\rbrace,\lbrace3,6,5\rbrace,\lbrace4,6,5\rbrace,\lbrace4,3,5\rbrace,\lbrace4,3,6,5\rbrace,\lbrace\phi\rbrace]()