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

Write a java program for a given 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

Below is the implementation of the above approach:

## Java

 `// Java program to print the sum of series`   `import` `java.io.*;` `import` `java.lang.*;`   `class` `GFG {` `    ``public` `static` `double` `sumOfSeries(``double` `num)` `    ``{` `        ``double` `res = ``0``, fact = ``1``;` `        ``for` `(``int` `i = ``1``; i <= num; i++) {` `            ``/*fact variable store factorial of the i.*/` `            ``fact = fact * i;`   `            ``res = res + (i / fact);` `        ``}` `        ``return` `(res);` `    ``}`   `    ``public` `static` `void` `main(String[] args)` `    ``{` `        ``double` `n = ``5``;` `        ``System.out.println(``"Sum: "` `+ sumOfSeries(n));` `    ``}` `}`   `// Code contributed by Mohit Gupta_OMG <(0_o)>`

Output

```Sum: 2.708333333333333
```

Time Complexity: O(n)
Auxiliary Space: O(1)

Please refer complete article on Program to find the sum of a Series 1/1! + 2/2! + 3/3! + 4/4! +…….+ n/n! for more details!

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