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The sum of the terms of a geometric progression is 2047.

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Joined: 29 Aug 2012
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The sum of the terms of a geometric progression is 2047. [#permalink]

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New post 11 Aug 2017, 09:17
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00:00
A
B
C
D
E

Difficulty:

  55% (hard)

Question Stats:

58% (01:08) correct 42% (00:59) wrong based on 33 sessions

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The sum of the terms of a geometric progression is 2047. Find the common ratio.

(1) The first and last terms of the series are 1 and 1024 respectively.

(2) Last but one term of the series is 512.
[Reveal] Spoiler: OA

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Re: The sum of the terms of a geometric progression is 2047. [#permalink]

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New post 11 Aug 2017, 09:26
Think it's C

Thanks,
Varsha

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Status: It always seems impossible until it's done!!
Joined: 29 Aug 2012
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Kudos [?]: 1446 [0], given: 270

Location: India
GMAT 1: 680 Q47 V34
WE: General Management (Aerospace and Defense)
GMAT ToolKit User Premium Member Reviews Badge CAT Tests
Re: The sum of the terms of a geometric progression is 2047. [#permalink]

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New post 11 Aug 2017, 09:29
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varshap wrote:
Think it's C

Thanks,
Varsha


Check again please. How did you arrive at C?
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Re: The sum of the terms of a geometric progression is 2047. [#permalink]

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New post 11 Aug 2017, 09:39
Because to calculate common ratio, I need 2 consecutive terms

Thanks,
Varsha

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Re: The sum of the terms of a geometric progression is 2047. [#permalink]

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New post 11 Aug 2017, 13:45
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Gnpth wrote:
The sum of the terms of a geometric progression is 2047. Find the common ratio.

(1) The first and last terms of the series are 1 and 1024 respectively.

(2) Last but one term of the series is 512.


In case there are people reading this question and worrying that they haven't learned about geometric progressions and common ratios, you need not worry. The GMAT does not expect you to be familiar with these terms. Likewise, you don't need to know the formula for the sum of a geometric series/sequence/progression.

Cheers,
Brent
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Re: The sum of the terms of a geometric progression is 2047.   [#permalink] 11 Aug 2017, 13:45
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