Sagot :
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} , { }
{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} , { }
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}
B={1}
C={}
D={2}
E={3}
F={4}
G={1,2}
H={1,3}
I={1,4}
J={2,3}
K={3,4}