Ononot — A recurrence an = c1 a{n-1} + c2 a{n-2} is called stable if

Recurrence Relationsmedium

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A recurrence $a_n = c_1 a_{n-1} + c_2 a_{n-2}$ is called stable if all roots $r$ of the characteristic equation satisfy $|r| < 1$ . Which of these is a stable recurrence?