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Program to find the sum of a Series 1/1! + 2/2! + 3/3! + 4/4! +…….+ n/n!

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You have been given a series 1/1! + 2/2! + 3/3! + 4/4! +…….+ n/n!, find out the sum of the series till nth term.
Examples : 
 

Input :n = 5
Output : 2.70833

Input :n = 7
Output : 2.71806


 


A simple solution is to one by one computer terms. For every term, find its corresponding factorial value.
An efficient solution is to do factorial computations in same loop.
 

CPP


                    

Java


                    

Python3


                    

C#


                    

PHP


                    

Javascript


                    

Output: 
 

Sum: 2.70833


Time Complexity: O(n)

Auxiliary Space: O(1), since no extra space has been taken.


 



Last Updated : 16 Feb, 2023
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