hard · GMAT Quant
A sequence a has positive integer first terms and satisfies a_(n+2)=a_(n+1)+a_n for every positive integer n. If a_5=19 and a_8=81, define a second sequence b by b_1=a_1, b_2=a_2, and b_(n+2)=b_(n+1)+b_n+1.
What is b_8?
- 81
- 88
- 100
- 102
- 101
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