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

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Manager
Joined: 29 Nov 2011
Posts: 80
The value of (a1 + a2 + a3 +… + an)(a1−1 + a2−1 + a3−1 +…+ a [#permalink]

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31 Jul 2012, 05:14
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0% (00:00) correct 100% (00:00) wrong based on 5 sessions

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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
Kaplan GMAT Instructor
Joined: 25 Aug 2009
Posts: 644
Location: Cambridge, MA
Re: The value of (a1 + a2 + a3 +… + an)(a1−1 + a2−1 + a3−1 +…+ a [#permalink]

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31 Jul 2012, 12:41
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!
_________________

Eli Meyer
Kaplan Teacher
http://www.kaptest.com/GMAT

Prepare with Kaplan and save $150 on a course! Kaplan Reviews Manager Joined: 29 Nov 2011 Posts: 80 Re: The value of (a1 + a2 + a3 +… + an)(a1−1 + a2−1 + a3−1 +…+ a [#permalink] ### Show Tags 31 Jul 2012, 23:10 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. Kaplan GMAT Instructor Joined: 25 Aug 2009 Posts: 644 Location: Cambridge, MA Re: The value of (a1 + a2 + a3 +… + an)(a1−1 + a2−1 + a3−1 +…+ a [#permalink] ### Show Tags 31 Jul 2012, 23:22 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! _________________ Eli Meyer Kaplan Teacher http://www.kaptest.com/GMAT Prepare with Kaplan and save$150 on a course!

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Re: The value of (a1 + a2 + a3 +… + an)(a1−1 + a2−1 + a3−1 +…+ a   [#permalink] 31 Jul 2012, 23:22
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