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For all positive integers \(n\), the \(n\)th triangular number \(T_n\) is defined as \(T_n = 1+2+3+ \cdots + n\). What is the greatest possible value of the greatest common divisor of \(4T_n\) and \(n-1\)?

 Nov 29, 2020
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I need help on this, too.

 Dec 4, 2020

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