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If a sequence is defined by an = a(n-1)*a(n-2) + 1 for n>=3

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Magoosh GMAT Instructor
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If a sequence is defined by an = a(n-1)*a(n-2) + 1 for n>=3 [#permalink] New post 31 Jan 2013, 10:05
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Difficulty:

  25% (medium)

Question Stats:

70% (01:48) correct 30% (02:07) wrong based on 63 sessions
Attachment:
AA sequence question.JPG
AA sequence question.JPG [ 18.93 KiB | Viewed 990 times ]

(A) 1
(B) 7
(C) 22
(D) 155
(E) 721

For help with sequence questions on the GMAT, as well as a complete solution to this question, see this post:
http://magoosh.com/gmat/2012/sequences- ... ment-13543

Experts --- feel free to share any tips you would like about sequences, especially recursive sequence such as this one.

Mike :-)
[Reveal] Spoiler: OA

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Mike McGarry
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Re: recursive sequence [#permalink] New post 01 Feb 2013, 03:37
I'm not an expert, but, in my opinion GMAT doesn't go too far with recursive sequences.
most of the questions I've seen are like this one - substituting numbers into a term repeatedly till you get the answer. Therefore, the most important things on these questions are not getting bogged down by the length of calculations and not making a stupid calculation error. ( I wrote things way neater than usual on my scratch pad when I had to do recursive calculations :) )
Re: recursive sequence   [#permalink] 01 Feb 2013, 03:37
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If a sequence is defined by an = a(n-1)*a(n-2) + 1 for n>=3

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