medium · GMAT Quant
Nimbus Rail (run 25) defines a sequence by a_1=1, a_n=-dfrac12a_n-1 if n is even, and a_n=a_n-1 if n is odd.
What is a_15+a_16+a_17?
- -1
- 0
- -dfrac18
- 1
- 2
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