Answers

2014-04-17T13:36:07+08:00
1.TRUE
2. TRUE
3. TRUE

1 3 1
2014-04-21T14:53:10+08:00
Actually, all of them are TRUE. Explanation?

1. 2 belongs to A, since 2 is an element to A.
2. {2} belongs to A, since {2} is an element of A.
3. An empty set or {} still belongs to A, because it belongs to one of the subsets of A.
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