INTRODUCTION TO SETS
Definition Set is a WELL DEFINED collection of objectsExample:
MeaningBag is a set which consists of well
definedObjects i.e. pencils, erasers, scale,books etc. These objects are the
elements ofthis set
Examples
Can a beautiful girl or group of beautiful girls be
a set?The answer is ‘NO’ because beauty is not well defined
ExamplesCan a group of boys be a collection of Set?
‘YES’ , group of boys is a set because numberof boys in the group are well defined
ExamplesA smart man …. Is it a Set?
Ans. ………
ExamplesGroup of teachers in school…….is it acollection of set?
Ans………
ExamplesCollection of prime numbers?
Ans…….
SETSIndiviual object in the set is called ELEMENT
or a MEMBER of the set.Sets are denoted by capital alphabets , e.g. A,
B, C etc.Elements of set are denoted by small
alphabets , e.g. a, b, c,etc Use curly braces to represent set.We could not repeat an element in a set.
Types of Sets
Types of
sets
empty set
Singeltonset
Finiteset
Infiniteset
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