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

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Joined: 10 Nov 2010
Posts: 247

Kudos [?]: 401 [0], given: 22

Location: India
Concentration: Strategy, Operations
GMAT 1: 520 Q42 V19
GMAT 2: 540 Q44 V21
WE: Information Technology (Computer Software)
when to use formula n*(First term+last term)/2 to calculate [#permalink]

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New post 02 Feb 2011, 22:43
when to use formula n*(First term+last term)/2 to calculate Sum of n terms in AP.
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Kudos [?]: 401 [0], given: 22

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Posts: 41891

Kudos [?]: 128976 [0], given: 12185

Re: when to use formula n*(First term+last term)/2 to calculate [#permalink]

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New post 03 Feb 2011, 02:25

Kudos [?]: 128976 [0], given: 12185

Re: when to use formula n*(First term+last term)/2 to calculate   [#permalink] 03 Feb 2011, 02:25
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when to use formula n*(First term+last term)/2 to calculate

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