Clearly this statement is false when \(7\vert n\).
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By Pitot Theorem, \(AB+CD = AC+BD = 12\), so \(CD=7\).
Here is a hint: use inverse modulo to get that \(n \equiv 3 \pmod5\)
The sequence is not geometric.
CPhill, this answer is ChatGPT-generated. Even though the answer is correct, please be more careful around such answers.
