Program to find the Nth term of series -1, 2, 11, 26, 47……
Given a number N, the task is to find the Nth term of this series:
-1, 2, 11, 26, 47, 74, .....
Examples:
Input: 3 Output: 11 Explanation: when N = 3 Nth term = ( (3 * N * N) - (6 * N) + 2 ) = ( (3 * 3 * 3) - (6 * 3) + 2 ) = 11 Input: 9 Output: 191
Approach:
The Nth term of the given series can be generalised as:
Nth term of the series : ( (3 * N * N) - (6 * N) + 2 )
Below is the implementation of the above problem:
Program:
C++
// CPP program to find N-th term of the series: // 9, 23, 45, 75, 113, 159...... #include <iostream> using namespace std; // calculate Nth term of series int nthTerm( int N) { return ((3 * N * N) - (6 * N) + 2); } // Driver Function int main() { // Get the value of N int N = 3; // Find the Nth term // and print it cout << nthTerm(N); return 0; } |
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Java
// Java program to find N-th term of the series: // 9, 23, 45, 75, 113, 159...... class GFG { // calculate Nth term of series static int nthTerm( int N) { return (( 3 * N * N) - ( 6 * N) + 2 ); } // Driver code public static void main(String[] args) { int N = 3 ; // Find the Nth term // and print it System.out.println(nthTerm(N)); } } // This code is contributed by bilal-hungund |
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Python3
# Python3 program to find N-th term # of the series: # 9, 23, 45, 75, 113, 159...... def nthTerm(N): #calculate Nth term of series return (( 3 * N * N) - ( 6 * N) + 2 ); # Driver Code if __name__ = = '__main__' : n = 3 #Find the Nth term # and print it print (nthTerm(n)) # this code is contributed by bilal-hungund |
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C#
// C# program to find N-th term of the series: // 9, 23, 45, 75, 113, 159...... using System; class GFG { // calculate Nth term of series static int nthTerm( int N) { return ((3 * N * N) - (6 * N) + 2); } // Driver code public static void Main() { int N = 3; // Find the Nth term // and print it Console.WriteLine(nthTerm(N)); } } // This code is contributed by inder_verma |
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PHP
<?php // PHP program to find N-th term of // the series: 9, 23, 45, 75, 113, 159...... // calculate Nth term of series function nthTerm( $N ) { return ((3 * $N * $N ) - (6 * $N ) + 2); } // Driver Code // Get the value of N $N = 3; // Find the Nth term // and print it echo nthTerm( $N ); // This code is contributed by Raj ?> |
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Output:
11
Time Complexity: O(1)
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