Question

basics of Sets in maths

Answer 1

hey here is ur ans


★★★★★

☆A set is a well-defined collection of objects.
☆Sets are usually represented by capital letters A, B, C, D, X, Y, Z, etc.
☆for example ... the set of natural numbers. We know that 4 is a natural number. However, −1 is not a natural number. We denote it as 4 ∈ N and −1 ∉ N.


three types★★★★
□ Description method
□Roster method or listing method or tabular form
□Set-builder form or rule method


Description method: In this method, a description about the set is made and it is enclosed in curly brackets { }.

For example: The set of composite numbers less than 30 is written as

{Composite numbers less than 30}


roster form.. The roster form enables us to see all the members of a set at a glance. A set of all integers greater than 5 and less than 9 will be represented in roster form as {6, 7, 8}.


but in set builder for. m..

L = {x : x is an integer greater than 5 and less than 9}