BdMO Online Forum

Posted: **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).

Posted: **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???

Posted: **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 $x$ ??

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