Check sibling questions
Chapter 1 Class 12 Relation and Functions
Serial order wise

Example 10 - Show f(1) = f(2) = 1 and f (x) = x - 1 is onto - To prove injective/ surjective/ bijective (one-one & onto)

Example 10    - Chapter 1 Class 12 Relation and Functions - Part 2

Introducing your new favourite teacher - Teachoo Black, at only ₹83 per month


Transcript

Example 10 Show that the function f : N N, given by f (1) = f (2) = 1 and f (x) = x 1, for every x > 2, is onto but not one-one. Here, f(x) = 1 for =1 1 for =2 1 for >2 Here, f (1) = 1 f (2) = 1. Check onto f: N N f(x) = 1 for =1 1 for =2 1 for >2 Let f(x) = y , such that y N Here, y is a natural number & for every y, there is a value of x which is a natural number Hence f is onto

Davneet Singh's photo - Teacher, Engineer, Marketer

Made by

Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 12 years. He provides courses for Maths and Science at Teachoo.