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Grade: 11
The value of 2*1!  +  5*2!  +  10*3!  +17*4!..... till 10 terms is :
what i did for this was break it into two parts..
general term : (n^2 +1)n!
∑n^2(n)!  +∑n!
i simplified the second term to (n+1)!-1, by the method of shifting the sum and subtracting it from itself (because it is an agp), the value i got for the second part is :  (11)!-1
i cannot figure out how to find the sum of the first part,please help!
also please tell me if I was doing the right thing.
Thank You.
one year ago

Answers : (1)

12 Points
Sorry my bad the sum of the second part is wrong due to a calculation mistake,so now the sum of both the parts are remaining to be found.
11 months ago
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