Arithmatic Sequence (Gmat Prep) : GMAT Problem Solving (PS)
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# Arithmatic Sequence (Gmat Prep)

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Intern
Joined: 01 Sep 2009
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14 Sep 2009, 07:58
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Can any body help in solving this question.....
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Re: Arithmatic Sequence (Gmat Prep) [#permalink]

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14 Sep 2009, 08:22
n = 10.
Series : 23,20,17,14,11,8,5,2,-1,-4 using the formula given. t2 = 23-3 = 20 and so on..
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Re: Arithmatic Sequence (Gmat Prep) [#permalink]

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14 Sep 2009, 08:42
Thanks..
got it....
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Re: Arithmatic Sequence (Gmat Prep) [#permalink]

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12 Jun 2010, 04:50
Same answer, using one of the sequence formulas: tn = t1 + (n-1)d ("d" = difference, here equals to "-3")

-4 = 23 + (n-1)(-3)
-27 = -3n + 3
n = 10
Re: Arithmatic Sequence (Gmat Prep)   [#permalink] 12 Jun 2010, 04:50
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