Friday, 28 February 2014

summation - Sum the series (12+1)1!+(22+1)2!+(32+1)3!cdots+(n2+1)n!

Problem:



Sum the series: (12+1)1!+(22+1)2!+(32+1)3!+(n2+1)n!



Source: A book on algebra.I came across this interesting looking series and decided to tackle it.




My try :



All I have tried is taking the rth term and summing it, but in vain:
Tr=(r2+1)r!


Tr=r2r!+r!

Now I don't know how to sum either of these terms.I'm not familiar with uni level math as I'm a high school student. All help appreciated!

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