hard · GMAT Quant
A sequence b_1, b_2, b_3, dots is defined by b_1 = 1, b_2 = 4, and b_n+2 = 4b_n+1 - 3b_n for all integers n ≥ 1.
How many of the first 90 terms, b_1, b_2, dots, b_90, are divisible by 3?
- 0
- 30
- 1
- 45
- 90
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