Example 22 - Chapter 1 Class 12 Relation and Functions
Last updated at July 5, 2019 by Teachoo
Transcript
Example 22 Let f : {1, 2, 3} {a, b, c} be one-one and onto function given by f (1) = a, f(2) = b and f (3) = c. Show that there exists a function g : {a, b, c} {1, 2, 3} such that gof= IX and fog = IY, where, X = {1, 2, 3} and Y = {a, b, c}. Finding gof So, gof = { (1, 1) , (2, 2), (3, 3) } = IX = Identity function on set X = {1, 2, 3} Finding fog fog = { (a, a) , (b, b), (c, c) } = IY = Identity function on set Y = {a, b, c}
Finding Inverse
Identity Function
Inverse of a function
How to check if function has inverse?
Example 22 You are here
Ex 1.3, 5
How to find Inverse?
Example 28 Important
Misc 11
Ex 1.3, 11 Important
Example 27
Example 23 Important
Misc 1
Ex 1.3 , 6 Important
Ex 1.3 , 14 Important
Misc 2
Ex 1.3 , 4
Example 24
Ex 1.3 , 8
Example 25 Important
Ex 1.3 , 9 Important
Chapter 1 Class 12 Relation and Functions
Concept wise
- Relations - Definition
- Empty and Universal Relation
- To prove relation reflexive, transitive, symmetric and equivalent
- Finding number of relations
- Function - Definition
- To prove one-one & onto (injective, surjective, bijective)
- Composite functions
- Composite functions and one-one onto
- Finding Inverse
- Inverse of function: Proof questions
- Binary Operations - Definition
- Whether binary commutative/associative or not
- Binary operations: Identity element
- Binary operations: Inverse
About the Author
Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.