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2015-06-04T19:38:02+08:00

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The subsets of a set are all possible sets within a set which 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}, { } 

Notice the pattern:
If we have 0 terms then we have 1 set; { } 
1 term ; {a} , { } - 2 
2 terms: {a,b}, {a}, {b} , { } - 4 
3 terms: {a,b,c}, {a,b}, {a,c}, {b,c}, {a}, {b}, {c}, { } - 8
4 terms: {a,b,c,d}, {a,b,c}, {a,b,d}, {b,c,d}, {a,b}, {a,c}, {a,d}, {b,c}, {b,d}, {c,d}, {a}, {b}, {c}, {d}, { } - 16

Notice that the number of terms is: 2^n
2 5 2
thank you very much!!
actually i know the answer but i need 32 subsets and i only got 30 ...and u gave me exact 32 subsets...THANK U VERY MUCH
Welcome! :) I'm happy to help.
uhm ..but what is the answer in the next question?--how many subsets does a set of n element have?