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## Answers

**Set Theory starts very simply: it examines whether an object**

**belongs**

**, or does**

**not**

**belong**

**, to a**

**set**

**of objects which has been described in some non-ambiguous way.**

**From this simple beginning, an increasingly complex (and useful!) series of ideas**

**can be developed, which lead to notations and techniques with many varied**

**applications. A set can be defined as a collection of things that are brought**

**together because they obey a certain rule.These 'things' may be anything you**

**like:**

**numbers, people, shapes, cities, bits of text ..., literally anything.The key fact**

**about the 'rule' they all obey is that it must be well-defined**

hope it helps............. :)

2 the team of eleven best cricket batsmen of the world = not set.

for example.

natural number, prime number quadrilaterals in a plane etc. all example see so far are well defined collection of objects or ideas. a well defined collection of onjects or ideas is known as a set. set theory is a comparitively new concept in mathematics..

all the objects in the set should have a common feature or property...

hope its help u..