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The value of (a1 + a2 + a3 +… + an)(a1−1 + a2−1 + a3−1 +…+ a

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Manager
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Joined: 29 Nov 2011
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Kudos [?]: 74 [0], given: 37

The value of (a1 + a2 + a3 +… + an)(a1−1 + a2−1 + a3−1 +…+ a [#permalink] New post 31 Jul 2012, 04:14
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Question Stats:

0% (00:00) correct 100% (00:00) wrong based on 3 sessions
The value of (a1 + a2 + a3 +… + an)(a1−1 + a2−1 + a3−1 +…+ an−1) can be

(A) n
(B) n²
(C) n² − 1
(D) n² − n
(E) none of these
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Kaplan GMAT Instructor
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Joined: 25 Aug 2009
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Location: Cambridge, MA
Followers: 68

Kudos [?]: 187 [0], given: 2

Re: The value of (a1 + a2 + a3 +… + an)(a1−1 + a2−1 + a3−1 +…+ a [#permalink] New post 31 Jul 2012, 11:41
Expert's post
Hi Smita,

This is labeled as Source:Kaplan, but can you specify the source? Also, can you clarify whether there are supposed to be any subscript notations in this problem? This looks like it might be a sequences problem, but the formatting may have gotten lost in the translation to a message board.

Thanks!
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Manager
Manager
avatar
Joined: 29 Nov 2011
Posts: 81
Followers: 1

Kudos [?]: 74 [0], given: 37

Re: The value of (a1 + a2 + a3 +… + an)(a1−1 + a2−1 + a3−1 +…+ a [#permalink] New post 31 Jul 2012, 22:10
KapTeacherEli wrote:
Hi Smita,

This is labeled as Source:Kaplan, but can you specify the source? Also, can you clarify whether there are supposed to be any subscript notations in this problem? This looks like it might be a sequences problem, but the formatting may have gotten lost in the translation to a message board.

Thanks!


Sir, here in a1, a2, .... , an, 1, 2, 3, ..., n are all subscripts. I hope that helps.
Expert Post
Kaplan GMAT Instructor
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Joined: 25 Aug 2009
Posts: 644
Location: Cambridge, MA
Followers: 68

Kudos [?]: 187 [0], given: 2

Re: The value of (a1 + a2 + a3 +… + an)(a1−1 + a2−1 + a3−1 +…+ a [#permalink] New post 31 Jul 2012, 22:22
Expert's post
Smita04 wrote:
KapTeacherEli wrote:
Hi Smita,

This is labeled as Source:Kaplan, but can you specify the source? Also, can you clarify whether there are supposed to be any subscript notations in this problem? This looks like it might be a sequences problem, but the formatting may have gotten lost in the translation to a message board.

Thanks!


Sir, here in a1, a2, .... , an, 1, 2, 3, ..., n are all subscripts. I hope that helps.

Unfortunately, it doesn't.

A letter with a subscript indicates a Sequence problem. However, Sequence questions on the GMAT will always give you information about the relevant sequence--it's like trying guess what 5&&6 means on a symbolism problem without the part of the problem defining &&. Something is missing from this problem, and without it, it's not solvable--sorry!
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Re: The value of (a1 + a2 + a3 +… + an)(a1−1 + a2−1 + a3−1 +…+ a   [#permalink] 31 Jul 2012, 22:22
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The value of (a1 + a2 + a3 +… + an)(a1−1 + a2−1 + a3−1 +…+ a

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