What is the value of the harmonic factorial series sum?

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SUMMARY

The harmonic factorial series sum, represented as ## \frac{1}{1!} + \frac{1}{2!} + \frac{1}{3!} + \frac{1}{4!} + ... ##, converges to the mathematical constant e - 1, approximately equal to 1.718. This conclusion is supported by references to calculus literature, specifically the Purcell Calculus textbook. The series is not classified as either geometric or arithmetic, which complicates its evaluation without advanced techniques.

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  • Understanding of factorial notation and operations
  • Familiarity with series convergence concepts
  • Basic knowledge of calculus, particularly Taylor series
  • Experience with mathematical constants, specifically Euler's number (e)
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terryds
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Homework Statement



What is the value of ## \frac{1}{1!} + \frac{1}{2!} + \frac{1}{3!} + \frac{1}{4!} + ... ## ?

Homework Equations


[/B]
I have no idea since it's neither a geometric nor arithmatic series

The Attempt at a Solution



[/B]
My Calculus purcell book tells me that it is e - 1 ≈ 1.718

But there are no ideas in it.
Please help
 
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