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GPREP (Sequences)

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Master | Next Rank: 500 Posts
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by zagcollins » Mon Jul 28, 2008 2:48 am
In the arithmetic sequence t1,t2,t3,tn....t1=23 and tn=tn-1 -3 for each n>1. What is the value of n when tn=-4?

A.-1
B.7
C.10
D.14
E.20
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by sudhir3127 » Mon Jul 28, 2008 3:00 am
Please search before posting .. Use this link .. Answer is 10.

https://www.beatthegmat.com/gmat-prep-ar ... t8798.html
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by ricky » Mon Jul 28, 2008 3:08 am
IMO C...
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by zagcollins » Tue Jul 29, 2008 3:21 am
didnt understand the explanation posted by camitava, can sum1 pls shed further light on this problem?
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by sudhir3127 » Tue Jul 29, 2008 6:12 am
In the arithmetic sequence t1,t2,t3,tn....t1=23 and tn=tn-1 -3 for each n>1. What is the value of n when tn=-4

Tn= a+ (n-1)d ( nth term formula)

23=-4 + (n-1)3

27= (n-1)*3
9 = n-1
n= 10..

Hope its clear...


P.S.. My 200th post :)
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by zagcollins » Tue Jul 29, 2008 9:32 am
really bad@ sequence probs.....get the explanation now, sudhir...thanks!
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