Reduced residue system modulo n prime p.

From: Saysero <saysero@xxxxxxxxx>
Date: Wed, 11 Jun 2008 13:13:26 -0700 (PDT)

A book I am reading contains the following problem:
"If (r_1),...,(r_p) is any reduced residue system modulo n prime p,
prove that Prod{(r_j) | 1<=j<=p-1} is congruent to -1 modulo p."
What is "reduced residue system modulo n prime p"? What is the
difference between "reduced residue system modulo n prime p" and
normal reduced residue system modulo n?
Thanks in advance.
.

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