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C++ program to Find Nth term of the series 1, 1, 2, 6, 24…
In this problem, we are given an integer N. Our task is to create a program to Find Nth term of series 1,1, 2, 6, 24, ...
Let’s take an example to understand the problem,
Input
N = 7
Output
720
Explanation
The series is − 1, 1, 2, 6, 24, 120, 720
Solution Approach
A simple approach to solve the problem is by using the general formula for the nth term of the series. The formula for,
Nth term = (N−1)!
Program to illustrate the working of our solution,
Example
#include <iostream>
using namespace std;
int calcNthTerm(int N) {
if (N <= 1)
return 1;
int factorial = 1;
for (int i = 1; i < N; i++)
factorial *= i;
return factorial;
}
int main() {
int N = 8;
cout<<N<<"th term of the series is "<<calcNthTerm(N);
return 0;
}Output
8th term of the series is 5040
Updated on: 15-Mar-2021
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