Let and . A function is defined by . State whether is injective and give a…

MATHEMATICS · Subjective · CBSE · Mathematics · Relations and Functions · Relations and Functions

Problem

Let

A=\{a,b,c,d\}

and

B=\{1,2,3\}

. A function

f:A\to B

is defined by

f(a)=1,\;f(b)=2,\;f(c)=1,\;f(d)=3

. State whether

f

is injective and give a reason.