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

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Manager
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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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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The proof of understanding is the ability to explain it.

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

Math Expert
Joined: 02 Sep 2009
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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03 Feb 2011, 02:25
GMATD11 wrote:
when to use formula n*(First term+last term)/2 to calculate Sum of n terms in AP.

Check this:
math-number-theory-88376.html
sequences-progressions-101891.html
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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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