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likewhoa
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 Posted: Sun Nov 25, 2007 7:29 am Post subject: advice needed |
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A(n)=2A(n-1)-X, A5=99, A3=27, X=?
answer:3 |
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sujaysolanki
Really wants to Beat The GMAT!
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Target GMAT Score: 650+
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| Posted: Sun Nov 25, 2007 8:36 am Post subject: |
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Nice one took me some time to figure out 
A5 = 99 A3 = 27
A5 = 2a4 - x
A4 = 2a3 - x
A5 = 2a4 - x
= 2 (2a3 - x) -x
NOw we know a5 = 99 and a3 = 27 ..Hence X on sloving comes to 3 |
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