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