Number of Functions | MATHS Class 11/12 | JEE 2021/2022/2023 | GB Sir

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Chapter: Relations & Functions
Pre-requisites: Definition of a Function, Classification of Functions

This video is focused on how to obtain the Number of Functions (Permutation based). This video explains how to find the number of One-one (Injective), Many-one, Onto (Surjective) and Into functions for three different cases. Case 1: When the number of elements in Domain and Co-domain is equal, Case 2: When the number of elements in Domain is more than that of in Co-domain and Case 3: When the number of elements in Domain is less than that of in Co-domain. The questions from this concept are frequently asked in JEE and other competitive examinations.

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