## Let us help one another preparing for BdMO national 2013

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Joined: Sun Jan 20, 2013 10:51 pm

### Re: Let us help one another preparing for BdMO national 2013

Problem no.3- For a positive integer n, ﬁnd the number of solutions of the congruence x
2 ≡ 1 (mod n).

sakib.creza
Posts: 26
Joined: Sat Nov 03, 2012 6:36 am

### Re: Let us help one another preparing for BdMO national 2013

Shadmanmajid wrote:Problem no.3- For a positive integer n, ﬁnd the number of solutions of the congruence x
2 ≡ 1 (mod n)
.
What does the portion in red mean???

nafistiham
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### Re: Let us help one another preparing for BdMO national 2013

Shadmanmajid wrote:Problem no.3- For a positive integer n, ﬁnd the number of solutions of the congruence x
2 ≡ 1 (mod n).
where is the $x$ ??
$\sum_{k=0}^{n-1}e^{\frac{2 \pi i k}{n}}=0$
Using $L^AT_EX$ and following the rules of the forum are very easy but really important, too.Please co-operate.