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

• Last Updated : 20 Jun, 2022

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

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

 

## Javascript

 

Output:

95.2628

Time complexity: O(1) since performing constant operations

Auxiliary Space: O(1) for constant space for variables

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