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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

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