Answers

2015-06-13T20:56:16+08:00
A group of items that is joined together
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2015-06-13T21:37:02+08:00
Well defined group of objects (elements) that share a common characteristics.
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a set is a collection of distinct objects, considered as an object in its own right. For example, the numbers 2, 4, and 6 are distinct objects when considered separately, but when they are considered collectively they form a single set of size three, written {2,4,6}.