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Consider functions f : [5] → [9] (a) How many of the functions are injective

Consider functions f : [5] → [9] (a) How many of the functions are injective

Algebra & Trigonometry with Analytic Geometry
Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter4: Polynomial And Rational Functions
Section4.5: Rational Functions
Problem 50E
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Consider functions f : [5] → [9]
(a) How many of the functions are injective

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Step 1

Given :  f :5→9 

Calculate : Number of injective functions.

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Follow-up Question

How many of these injective functions are increasing? (i.e. if a<b then f(a) < f(b). 

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