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Sum of the series 0.6, 0.06, 0.006, 0.0006, …to n terms
• Last Updated : 19 Mar, 2021

Given the number of terms i.e. n. Find the sum of the series 0.6, 0.06, 0.006, 0.0006, …to n terms.
Examples:

Input : 2
Output : 0.65934

Input : 3
Output : 0.665334

Lets denote the sum by S:
Using the formula , we have [since r<1]   Hence the required sum is Below is the implementation:

## C++

 // CPP program to find sum of 0.6, 0.06,// 0.006, 0.0006, ...to n terms#include using namespace std; // function which return the// the sum of seriesfloat sumOfSeries(int n){    return (0.666) * (1 - 1 / pow(10, n));} // Driver codeint main(){    int n = 2;    cout << sumOfSeries(n);}

## Java

 // java program to find sum of 0.6, 0.06,// 0.006, 0.0006, ...to n termsimport java.io.*; class GFG{    // function which return the    // the sum of series    static double sumOfSeries(int n)    {        return (0.666) * (1 - 1 /Math. pow(10, n));    }              // Driver code    public static void main (String[] args)    {        int n = 2;        System.out.println ( sumOfSeries(n));             }} // This code is contributed by vt_m

## Python3

 # Python3 program to find# sum of 0.6, 0.06, 0.006,# 0.0006, ...to n termsimport math # function which return# the sum of seriesdef sumOfSeries(n):    return ((0.666) *            (1 - 1 / pow(10, n))); # Driver coden = 2;print(sumOfSeries(n)); # This code is contributed by mits

## C#

 // C# program to find sum of 0.6, 0.06,// 0.006, 0.0006, ...to n termsusing System; class GFG {         // function which return the    // the sum of series    static double sumOfSeries(int n)    {        return (0.666) * (1 - 1 /Math. Pow(10, n));    }         // Driver code    public static void Main ()    {        int n = 2;                 Console.WriteLine( sumOfSeries(n));             }} // This code is contributed by vt_m

## PHP

 

## Javascript

 

Output:

0.65934

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