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GRE Math Challenge #10- The nth term of sequence

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Director
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Joined: 16 May 2014
Posts: 594
GRE 1: Q165 V161
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Kudos [?]: 440 [0], given: 64

GRE Math Challenge #10- The nth term of sequence [#permalink] New post 05 Aug 2014, 03:49
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Question Stats:

90% (00:34) correct 10% (00:00) wrong based on 10 sessions
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A question on series.
[Reveal] Spoiler: OA

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If you find this post helpful, please press the kudos button to let me know ! :)

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Intern
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Re: GRE Math Challenge #10 [#permalink] New post 06 Aug 2014, 01:44
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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)
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Re: GRE Math Challenge #10- The nth term of sequence [#permalink] New post 08 Dec 2017, 00:17
a odd are -1
a even are 1
so the answer is B
Re: GRE Math Challenge #10- The nth term of sequence   [#permalink] 08 Dec 2017, 00:17
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GRE Math Challenge #10- The nth term of sequence

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