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need help with Important Math Formula for GMAT

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need help with Important Math Formula for GMAT [#permalink] New post 20 Feb 2009, 18:44
Hi all can we post helpful formulas for the test in this thread?

I have 2: L=a+(n-1)d
sum(of a sequence)= n/2[2a+(n-1)d]where L= last term, a=1st term and d=constant difference among the terms.

I need more sequence formula.
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Re: need help with Important Math Formula for GMAT [#permalink] New post 17 Mar 2009, 07:54
RockHe wrote:
Hi all can we post helpful formulas for the test in this thread?

I have 2: L=a+(n-1)d
sum(of a sequence)= n/2[2a+(n-1)d]where L= last term, a=1st term and d=constant difference among the terms.

I need more sequence formula.



Arent there as many sequence formulas as there are unique sequences? That's the point of a sqeuence, it's defined by a particular formula.
Re: need help with Important Math Formula for GMAT   [#permalink] 17 Mar 2009, 07:54
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need help with Important Math Formula for GMAT

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