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Recursionmedium
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A recurrence relation an=an−1+2an−2a_n = a_{n-1} + 2a_{n-2}an​=an−1​+2an−2​ with a0=1,a1=1a_0=1, a_1=1a0​=1,a1​=1 has characteristic roots r1=2,r2=−1r_1=2, r_2=-1r1​=2,r2​=−1. What is the specific solution?