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If a sequence is defined by a_n = (a_(n-1))*(a_(n-2)) for all n >=3

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If a sequence is defined by a_n = (a_{n-1})*(a_{n-2}) for all n\geq3, and if a_1 = 1 and a_2 = 1, what is the 6th term?
(A) 1
(B) 7
(C) 22
(D) 155
(E) 721


For a discussion of questions involving sequences, especially recursive sequences such as this one, as well as the OE for this question, please see:
http://magoosh.com/gmat/2012/sequences-on-the-gmat/

Mike :-)

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