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For a certain sequence, A(1)= -1, A(2)=1. When n>=3,

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Director
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For a certain sequence, A(1)= -1, A(2)=1. When n>=3, [#permalink]

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11 Dec 2005, 06:35
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For a certain sequence, A(1)= -1, A(2)=1. When n>=3, A(n)=A(n-1)-A(n-2), what is the sum of the first 1000 items?
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Director
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11 Dec 2005, 08:39
A1=-1, A2=1,A3=2, A4=1, A5=-1,A6=-2,A7=-1,A8=1,A9=2,A10=1 so seems like 300

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Manager
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12 Dec 2005, 13:17
christoph wrote:
2 !

I am getting 0...

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VP
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12 Dec 2005, 14:34
christoph wrote:
2 !

I am getting 0...

sequence is -1121-1-2, which adds to 0 ! sum of 1st to 996th-item is 0. 997th item is -1, etc..so its not 2 but 3 !
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12 Dec 2005, 14:34
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