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Please solve this question urgently I can't understand how to solve the questions related to factorials.can you help me

Please solve this question urgently
I can't understand how to solve the questions related to factorials.can you help me
 

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Grade:12

1 Answers

Aditya Gupta
2081 Points
5 years ago
Write it as (r+1)^2*r! - 2r*r!
= (r+1)*(r+1)! - r*r! - [(r+1)! -r!]
Since both of the above sequences are trlestelic, the sum can be easily found out

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