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Recurrence Relationsmedium
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The sequence an=7+2⋅3n+4n⋅3na_n = 7 + 2 \cdot 3^n + 4n \cdot 3^nan​=7+2⋅3n+4n⋅3n (constant, exponential, and resonant exponential terms) is annihilated by which operator (using shift operator EEE)?