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On the GMAT, the first term of a sequence is always a_1 (or b_1, or f(1), etc). Still, they always tell you that in the question itself, so I'm guessing the question above is not a real GMAT question. _________________
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Actually it happens many timesthat we forget to consider case 0 .. this time i specially paid attention and i got wrong ..so i was little annoyed and disappoint.. but from now i will consider series to be start from1 if not specified.
Check out this awesome article about Anderson on Poets Quants, http://poetsandquants.com/2015/01/02/uclas-anderson-school-morphs-into-a-friendly-tech-hub/ . Anderson is a great place! Sorry for the lack of updates recently. I...