# Find sum of the series ?3 + ?12 +……… upto N terms

Given a number n, the task is to find the sum of first n terms of this series. Below is the series: Examples:

Input: n = 10
Output: 95.2628

Input: n = 5
Output: 25.9808


## Recommended: Please try your approach on {IDE} first, before moving on to the solution.

This series can be seen as- Below is the required implementation:

## C++

 // C++ implementation of above approach  #include  #define ll long long int  using namespace std;     // Function to find the sum  double findSum(ll n)  {         // Apply AP formula      return sqrt(3) * (n * (n + 1) / 2);  }  // Driver code  int main()  {      // number of terms      ll n = 10;         cout << findSum(n) << endl;      return 0;  }

## Java

 // Java implementation of   // above approach  import java.io.*;     class GFG   {     // Function to find the sum  static double findSum(long n)  {      // Apply AP formula      return Math.sqrt(3) * (n *                       (n + 1) / 2);  }  // Driver code  public static void main (String[] args)   {      // number of terms      long n = 10;             System.out.println( findSum(n));  }  }     // This code is contributed   // by inder_verma..

## Python3

 # Python3 implementation of above approach     #Function to find the sum  import math  def findSum(n):      # Apply AP formula      return math.sqrt(3) * (n * (n + 1) / 2)     # Driver code   # number of terms  if __name__=='__main__':      n = 10     print(findSum(n))     # This code is contributed by sahilshelangia

## C#

 // C# implementation of   // above approach  using System;     class GFG   {     // Function to find the sum  static double findSum(long n)  {      // Apply AP formula      return Math.Sqrt(3) * (n *                       (n + 1) / 2);  }  // Driver code  public static void Main ()   {      // number of terms      long n = 10;             Console.WriteLine( findSum(n));  }  }     // This code is contributed   // by inder_verma..

## PHP

 

Output:

95.2628


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Improved By : sahilshelangia, inderDuMCA