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