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2015-06-02T21:43:48+08:00

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The subsets of a set is just the possible sets within a set so the subsets are:
{1}, {3}, {5}, {7}, {9}, {1,3}, {1,5}, {1,7}, {1,9}, {3,5}, {3,7}, {3,9}, {5,7}, {5,9}, {7,9}, {1,3,5}, {1,3,7}, {1,3,9}, {1,5,7}, {1,5,9}, {1,7,9}, {3,5,7}, {3,5,9}, {3,7,9}, {5,7,9}, {1,3,5,7}, {1,3,5,9}, {1,3,7,9}, {1,5,7,9}, {3,5,7,9}, {1,3,5,7,9} , { } 
2 4 2
aren't they all proper subsets?? except for {1,3,5,7}
All of them are proper subsets except for the set itself and the null set, {1,3,5,7,9} and { }
aaahh so it could be all consider???
The only improper subsets are {1,3,5,7,9} and { }. Since you are asking for subsets, all of them are possible.
Thank you so muuuuuch! Let's talk in fb, if u have time :)
2015-06-07T18:58:21+08:00
A={1,2,3,4}
B={1}
C={}
D={2}
E={3}
F={4}
G={1,2}
H={1,3}
I={1,4}
J={2,3}
K={3,4}

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