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Re: The value of (a1 + a2 + a3 +… + an)(a1−1 + a2−1 + a3−1 +…+ a [#permalink]
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.

Re: The value of (a1 + a2 + a3 +… + an)(a1−1 + a2−1 + a3−1 +…+ a [#permalink]
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.

Re: The value of (a1 + a2 + a3 +… + an)(a1−1 + a2−1 + a3−1 +…+ a [#permalink]
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! _________________