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Question: Help with finding "onto" functions

Question:Help with finding "onto" functions

kim110905 0 Maple
image modp
April 10 2012
0

Given:

f:=proc(a) x->modp(a*x,256); end proc:

Determine for which values of a in Z[256] the functions f(a) are onto.

I know that I need to use evalb to check if the image and coDomain are the same. I just cannot get it to work.
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