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when to use formula n*(First term+last term)/2 to calculate

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Senior Manager
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Joined: 10 Nov 2010
Posts: 268
Location: India
Concentration: Strategy, Operations
GMAT 1: 520 Q42 V19
GMAT 2: 540 Q44 V21
WE: Information Technology (Computer Software)
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when to use formula n*(First term+last term)/2 to calculate [#permalink] New post 02 Feb 2011, 21:43
when to use formula n*(First term+last term)/2 to calculate Sum of n terms in AP.
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Re: when to use formula n*(First term+last term)/2 to calculate [#permalink] New post 03 Feb 2011, 01:25
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Re: when to use formula n*(First term+last term)/2 to calculate   [#permalink] 03 Feb 2011, 01:25
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when to use formula n*(First term+last term)/2 to calculate

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