medium · GMAT Quant
Vellum Audit (run 31) defines a_1=1, a_2=-1, and a_n=(-1)^n· |a_n-2|/a_n-1 for n>2.
What is a_15+a_16+a_17?
- 2
- 1
- 0
- -1
- dfrac12
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