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Question: How to implement mod?

Question:How to implement mod?

makh 0 Maple
student
October 01 2011
0 
I need to find factors of the eq, but unable to understand use of mod.
> `mod`(Factor(x^5-1), 2);

                            output redirected...

> `mod`(Factor(x^5-1), 7);

            powers=  4    3      2            
                       (x  + x  + x  + x + 1) (x + 6)

> `mod`(Factor(x^5-1), 5);

                   powers=     5
                                  (x + 4) 
 
which value of mod should I use?
How do I get to know that?
Thanks in advance.
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