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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] New post 11 Dec 2005, 05:35
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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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 [#permalink] New post 11 Dec 2005, 07:39
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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 [#permalink] New post 12 Dec 2005, 12:17
christoph wrote:
2 !


Can you explain your answer?

I am getting 0...
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 [#permalink] New post 12 Dec 2005, 13:34
stretchad wrote:
christoph wrote:
2 !


Can you explain your answer?

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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  [#permalink] 12 Dec 2005, 13:34
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For a certain sequence, A(1)= -1, A(2)=1. When n>=3,

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