Calculus - Inadequate Information #1

Calculus Level 3

Two infinite sequences \(\{a_n\}\) and \(\{b_n\}\) satisfy the following recurrence relations: \[ \cases{a_{n+1}=a_n+2b_n \\\\ b_{n+1}=a_n+b_n.}\] Given that \(a_nb_n>0\) for any positive integer \(n,\) \[ \lim_{n\to\infty}{\dfrac{b_n}{a_n}}=\dfrac{N\sqrt{Q}}{D},\] where positive integers \(D\) and \(N\) are coprime and \(Q\) is a square-free integer.

Find the value of \(N+Q+D.\)


This problem is a part of <Calculus - Inadequate Information> series.

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