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I have this question.

 

I can't figure this out.

 Aug 5, 2019
 #1
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If \(a, b, c\) are positive integers less than \(13\) such that

\(\begin{align*} 2ab+bc+ca&\equiv 0\pmod{13}\\ ab+2bc+ca&\equiv 6abc\pmod{13}\\ ab+bc+2ca&\equiv 8abc\pmod {13} \end{align*}\)

then determine the remainder when \(a+b+c\) is divided by \(13\).

 

answer see: https://web2.0calc.com/questions/help-me_17340

 

laugh

 Aug 6, 2019

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