Answers

2015-06-14T14:33:50+08:00
Set is a specific group of objects/things which are called elements.
A set can only be a subset if the subset's elements are from a certain set. A subset can be set itself.
Empty Set can also be called Null Set (Symbol: Ф), It is aset tha doesn't have elements. Empty set can also be a subset of any set.
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