Factorial Series in Java (Series #7)

Factorial Series in Java

Question : Write a program to print the following series.

S = 2! + (2! + 3!) - (2! + 3! + 5!) + (2! + 3! + 5! + 7!)......... n terms

The above series is very easy to solve

Logic :-

• First input number of terms

• The nth term will contain 'n' number of terms (ex- if n = 2, then it will contain 2 terms i.e. (2! + 3!))

• calculate the nth term by first finding the first 'n' number of prime numbers

• Now, calculate factorial of each prime number

• Add the factorials of all the prime numbers

• Now if the nth term is odd and not the first then it will be a negative term

• else it will be a positive term

• Store the result in the variable accordingly

• Print the result

Note : To understand the program clearly watch this video : https://youtu.be/CRX9zDJYY4U

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Program to print the Series :-

Checkout Source Code : Click here

Program Video : Watch Now