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Algebra

Cool goIITian

Joined:	26 Oct 2011
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29 Oct 2011 19:17:39 IST

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sum to n terms3.7.11.15+7.11.15.19+...................

Mathematics

sum to n terms3.7.11.15+7.11.15.19+...................

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hemang

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Joined: 27 Dec 2010

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2 Nov 2011 10:51:21 IST

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the nth terms is (n+2)(n+6)(n+10)(n+15).

boywholived

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10 Feb 2012 20:39:19 IST

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sorry hemag your nth term is wrongcorrect answer to the question is 1/120*{(4n-1)(4n+3)(4n+7)(4n+11)(4n+15)+3465)if you want you can verify by substituting

boywholived

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10 Feb 2012 20:40:49 IST

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sorry

there was a typing error it is not 120 but 20

1/20*{(4n-1)(4n+3)(4n+7)(4n+11)(4n+15)+3465)}

boywholived

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10 Feb 2012 20:51:31 IST

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sorrythere was a typing error it is not 120 but 201/20*{(4n-1)(4n+3)(4n+7)(4n+11)(4n+15)+3465)}...

boywholived

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Joined: 10 Feb 2012

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10 Feb 2012 20:52:06 IST

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sorry

there was a typing error it is not 120 but 20

1/20*{(4n-1)(4n+3)(4n+7)(4n+11)(4n+15)+3465)}.........

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