**The Program in C++ to Find out Sum of an A.P. series is given below**:

```
#include <iostream>
using namespace std;
int main() {
int a, d, n;
cout <<"Hello Codeauri Family, enter the first term of the series here:\n";
cin >> a;
cout<< "similarly,enter the common difference here:\n";
cin >>d;
cout<< "and enter the number of terms here:\n";
cin >> n;
int sum = (n * (2 * a + (n - 1) * d)) / 2;
cout << "Well, The sum of the A.P. series is: " << sum << endl;
return 0;
}
```

## Output:

Hello Codeauri Family, enter the first term of the series here:

6

similarly,enter the common difference here:

7

and enter the number of terms here:

5

Well, The sum of the A.P. series is: 100

## Pro-Tips**💡**

This program prompts the user to enter the first term (a), common difference (d) and number of terms (n) of an A.P (Arithmetic progression) series,

then use the formula Sum = n/2 * (2*a + (n-1)*d) to calculate the sum of the series, and finally print out the result.

It uses standard input/output library

It’s important to note that an Arithmetic Progression is a sequence of numbers in which the difference between any two consecutive terms is always a constant.

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