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`        Sir please help me solve this problem. (ATTACHED).I do not know the summesion of factorial and how to solve the summesion of product of an expression with a factorial. `
one year ago

1805 Points
```							rth term is (r^2 – r+1)*r! = [(r+1)^2 – 3r]*r!= (r+1)*(r+1)! – r*r! – 2[(r+1)! – r!]now obviously (r+1)*(r+1)! – r*r! telescopes and (r+1)! – r! telescopes too! note that here we have used the following property of factorials:(k+1)!= (k+1)*k!
```
one year ago
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### Course Features

• 731 Video Lectures
• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions