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Recursionmedium
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For the recurrence an=3an−1−2an−2a_n = 3a_{n-1} - 2a_{n-2}an​=3an−1​−2an−2​ with a0=2a_0 = 2a0​=2 and a1=3a_1 = 3a1​=3, what is the characteristic equation and its roots?