hard · GMAT Quant
A semiconductor fabrication process tracks wafer defect numbers W_n using W_1 = 1, W_2 = 1, and W_n = W_n-1 + 3W_n-2 for all integers n ≥ 3.
What is the value of W_6?
- 19
- 40
- 97
- 13
- 31
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