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Re: Sn = 2Sn-1 + 4 and Qn = 4Qn-1 + 8 for all n > 1. If S5 = Q4 [#permalink]

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12 Jan 2012, 04:00

1

This post received KUDOS

enigma123 wrote:

Sn = 2Sn-1 + 4 and Qn = 4Qn-1 + 8 for all n > 1. If S5 = Q4 and S7 = 316, what is the first value of n for which Qn is an integer? (A) 1 (B) 2 (C) 3 (D) 4 (E) 5

Any idea how to solve these guys? I have given up after scratching my head for a while.

Assuming I have understood the symbols used correctly answer is C- 3

Re: Sn = 2Sn-1 + 4 and Qn = 4Qn-1 + 8 for all n > 1. If S5 = Q4 [#permalink]

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26 Oct 2014, 04:46

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Re: Sn = 2Sn-1 + 4 and Qn = 4Qn-1 + 8 for all n > 1. If S5 = Q4 [#permalink]

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17 Nov 2015, 10:39

Hello from the GMAT Club BumpBot!

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Re: Sn = 2Sn-1 + 4 and Qn = 4Qn-1 + 8 for all n > 1. If S5 = Q4 [#permalink]

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16 Feb 2016, 23:14

I wonder,why is it 700 level que? It is quite simple it is given \(2S_4=4Q_3+4\) \(S_4=2[Q_3+1]\)....i

we have been given that S_7=316 from this we can calculate S_6 and then ultimately S_4 \(S_4=36\) putting this in equ i \(Q_3=17\) ...ans
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