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# GRE Math Challenge #10- The nth term of sequence

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Director
Joined: 16 May 2014
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GRE 1: Q165 V161
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GRE Math Challenge #10- The nth term of sequence [#permalink]  05 Aug 2014, 03:49
Expert's post
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Question Stats:

92% (00:32) correct 7% (00:00) wrong based on 13 sessions
Attachment:

q4.png [ 36.64 KiB | Viewed 1795 times ]

A question on series.
[Reveal] Spoiler: OA

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Intern
Joined: 18 Jun 2014
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Kudos [?]: 26 [1] , given: 15

Re: GRE Math Challenge #10 [#permalink]  06 Aug 2014, 01:44
1
KUDOS
Using a1 = -1, we get a2 = (-)a1 = 1
similarly a3 would be -1. Therefore, the odd nos. in the series will be (-)1 and even nos. will be 1.
Hence, a5 = (-)1. Column (B) is greater than Column (A).

The correct answer would be (B)
Manager
Joined: 03 Dec 2017
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Kudos [?]: 16 [0], given: 20

Re: GRE Math Challenge #10- The nth term of sequence [#permalink]  08 Dec 2017, 00:17
a odd are -1
a even are 1
Re: GRE Math Challenge #10- The nth term of sequence   [#permalink] 08 Dec 2017, 00:17
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