1!+2!+........+50!=?

• this summation can be defined by reverse recurssion
  if you want the sum of the factorials from 1 to n then start with
  s(n) = n
  and then
  s(i) = i * ( 1 + s(i+1) )
  and s(1) gives the summation
  for example if n=4 we have
  s(4)=4
  s(3)=3*(4+1)=15
  s(2)=2*(15+1)=32
  s(1)=1*(28+1)=33
  which agrees with
  1!+2!+3!+4! = 1+2+6+24
  using a computer program and using this recurssion method I get the sum as
  31035053229546199656252032972759319953…
  
  i dont think there is a mathematical formula for it.. but the following program works
  
  public class A
  {
  public static void main(String[] args)
  {
  int answer = 1;
  int sum = 0;
  for (int i = 1; i
• 12 years agoHelpfull: Yes(3) No(20)