hard · GMAT Quant
An automated inventory system updates stock levels S_n at step n according to the rule S_1 = 1, S_2 = 3, and S_n = S_n-1 + 2S_n-2 for all integers n ≥ 3.
What is the value of S_8?
- 85
- 171
- 341
- 54
- 127
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