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Recursionmedium
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The recurrence Tn=2Tn−1+9T_n = 2T_{n-1} + 9Tn​=2Tn−1​+9 with T0=0T_0 = 0T0​=0 has solution Tn=9(2n−1)T_n = 9(2^n - 1)Tn​=9(2n−1). What is T3T_3T3​?