Let us help one another preparing for BdMO national 2013

Discussion on Bangladesh Mathematical Olympiad (BdMO) National
Shadmanmajid
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Re: Let us help one another preparing for BdMO national 2013

Unread post by Shadmanmajid » Thu Feb 07, 2013 7:36 pm

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

sakib.creza
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Re: Let us help one another preparing for BdMO national 2013

Unread post by sakib.creza » Thu Feb 07, 2013 8:59 pm

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??? :? :? :?

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

Unread post by nafistiham » Thu Feb 07, 2013 10:37 pm

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.
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