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GMATprep DS: progression

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Manager
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GMATprep DS: progression [#permalink] New post 29 Dec 2009, 04:50
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 100% (00:08) wrong based on 3 sessions
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Manager
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Re: GMATprep DS: progression [#permalink] New post 29 Dec 2009, 07:58
IMO D

for k =odd \(a_k\) will be \(a_1\) =1 ; \(a_3\)=3 ; \(a_5\)=5 ; so on

for k=even \(a_k\)=-\(a_(k-1)\) will be \(a_2\)=-\(a_1\)=-1; \(a_4\)=-3 ; \(a_6\)=-5 :SO ON

SEQUENCE will be

1-1+3-3+5-5+7-7 ( when n is even sum=0 and when n=odd sum=n)

s1) for all n=odd sum=n and hence it is either +1,+3,+5,+7.....SO ON BUT ALL +VE
HENCE SUFF

s2)if \(a_n\) is +ve -----> n is odd and hence sum is +ve =n
hence suff
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Kudos [?]: 133 [0], given: 25

Re: GMATprep DS: progression [#permalink] New post 29 Dec 2009, 08:42
Thanks guys
OA is
[Reveal] Spoiler:
D
Re: GMATprep DS: progression   [#permalink] 29 Dec 2009, 08:42
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GMATprep DS: progression

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