medium · GMAT Quant
A telecom bandwidth optimization coefficient d_n is defined by d_1 = 4, d_2 = 1, and d_n = d_n-1 + 6d_n-2 for all integers n ≥ 3.
What is the value of d_5?
- 31
- 56
- 181
- 211
- 367
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