Ononot — A sequence satisfies an = a{n-1} + a{n-2} + a{n-3}. Let \alp

Recurrence Relationshard

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A sequence satisfies $a_n = a_{n-1} + a_{n-2} + a_{n-3}$ . Let $\alpha, \beta, \gamma$ be the roots of the characteristic equation. Which expression gives the closed form for $a_n$ ?