Hi I was having a little trouble with this question that prove if p is a prime having the form $4k+3$, and if $m$ is the number of quadratic residues less than $p/2$,
then $$1.3.5...(p-2)≡(-1)^{m+k+1}\pmod p$$,
and$$2.4.6...(p-1)≡(-1)^{m+k}\pmod p$$
I just dont understand the question.