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Find N Geometric Means between A and B

  • Difficulty Level : Medium
  • Last Updated : 07 Apr, 2021

Given three integers A, B and N the task is to find N Geometric means between A and B. WE basically need to insert N terms in a Geometric progression. where A and B are first and last terms. 
Examples: 
 

Input :  A = 2  B = 32  N = 3
Output : 4 8 16
the geometric progression series as 2,
4, 8, 16 , 32
       
Input : A = 3 B = 81 N = 2
Output : 9 27

 

Approach : 
Let A1, G2, G3, G4……Gn be N geometric Means between two given numbers A and B . Then A, G1, G2 ….. Gn, B will be in Geometric Progression . 
So B = (N+2)th term of the Geometric progression.
Then Here R is the common ratio 
B = A*RN+1 
RN+1 = B/A 
R = (B/A)1/(N+1)
Now we have the value of R 
And also we have the value of the first term A 
G1 = AR1 = A * (B/A)1/(N+1) 
G2 = AR2 = A * (B/A)2/(N+1) 
G3 = AR3 = A * (B/A)3/(N+1) 



GN = ARN = A * (B/A)N/(N+1)
 

C++




// C++ program to find n geometric means
// between A and B
#include <bits/stdc++.h>
using namespace std;
 
// Prints N geometric means between
// A and B.
void printGMeans(int A, int B, int N)
{
    // calculate common ratio(R)
    float R = (float)pow(float(B / A),
                  1.0 / (float)(N + 1));
     
    // for finding N the Geometric
    // mean between A and B
    for (int i = 1; i <= N; i++)
        cout << A * pow(R, i) <<" ";   
}
 
// Driver code to test above
int main()
{
    int A = 3, B = 81, N = 2;
    printGMeans(A, B, N);   
    return 0;
}

Java




// java program to illustrate
// n geometric mean between
// A and B
import java.io.*;
import java.lang.*;
import java.util.*;
 
public class GFG {
 
    // insert function for calculating the means
    static void printGMeans(int A, int B, int N)
    {      
        // Finding the value of R Common ration
        float R = (float)Math.pow((float)(B / A),
                           1.0 / (float)(N + 1));
                            
        // for finding N the Geometric
        // mean between A and B
        for (int i = 1; i <= N; i++)
          System.out.print(A * Math.pow(R, i) + " ");
         
    }
 
    // Driver code
    public static void main(String args[])
    {
        int A = 3, B = 81, N = 2;
        printGMeans(A, B, N);
    }
}

Python3




# Python3 program to find
# n geometric means
# between A and B
import math
 
# Prints N geometric means
# between A and B.
def printGMeans(A, B, N):
     
    # calculate
    # common ratio(R)
    R = (math.pow((B / A),
          1.0 / (N + 1)));
     
    # for finding N the
    # Geometric mean
    # between A and B
    for i in range(1, N + 1):
        print(int(A * math.pow(R, i)),
                           end = " ");
 
# Driver Code
A = 3;
B = 81;
N = 2;
printGMeans(A, B, N);
     
# This code is contributed
# by mits

C#




// C# program to illustrate
// n geometric mean between
// A and B
using System;
 
public class GFG {
 
    // insert function for calculating the means
    static void printGMeans(int A, int B, int N)
    {
         
        // Finding the value of R Common ration
        float R = (float)Math.Pow((float)(B / A),
                        1.0 / (float)(N + 1));
                             
        // for finding N the Geometric
        // mean between A and B
        for (int i = 1; i <= N; i++)
            Console.Write(A * Math.Pow(R, i) + " ");
         
    }
 
    // Driver code
    public static void Main()
    {
        int A = 3, B = 81, N = 2;
         
        printGMeans(A, B, N);
    }
}
 
// This code is contributed by vt_m.

PHP




<?php
// PHP program to find
// n geometric means
// between A and B
 
// Pr$s N geometric means
// between A and B.
function printGMeans($A, $B, $N)
{
     
    // calculate common ratio(R)
    $R = pow(($B / $A),
             1.0 / ($N + 1));
     
    // for finding N the Geometric
    // mean between A and B
    for ($i = 1; $i <= $N; $i++)
        echo $A * pow($R, $i) ," ";
}
 
    // Driver Code
    $A = 3;
    $B = 81;
    $N = 2;
    printGMeans($A, $B, $N);
     
// This code is contributed by anuj_67.
?>

Javascript




<script>
// JavaScript program to illustrate
// n geometric mean between
// A and B
 
    // insert function for calculating the means
    function printGMeans(A, B, N)
    {      
        // Finding the value of R Common ration
        let R = Math.pow((B / A),
                           1.0 / (N + 1));
                              
        // for finding N the Geometric
        // mean between A and B
        for (let i = 1; i <= N; i++)
          document.write(A * Math.pow(R, i) + " ");
           
    }
 
// Driver Code
        let A = 3, B = 81, N = 2;
        printGMeans(A, B, N);
 
// This code is contributed by code_hunt.
</script>

Output : 
 

9 27 

 

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