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August 24th, 2011, 02:51 AM  #1 
Banned Camp Joined: Aug 2011 Posts: 534 Thanks: 2  Computing Factorial of a Number
Referring to the link for Factorial http://en.wikipedia.org/wiki/Factorial The formula for computing Factorial of a Non Negative Number is n!=n*(n1)! if n > 0 0! = 1 5!= 5*(51)! = 120 In the first case by the convention that the product of no numbers at all is 1 as defined by Wikipedia. Here 0!=1, because the product of no numbers at all is 1. Why 0!=1 ? and not Undefined similar to any number divided by zero is Undefined or Infinite OR 0!=0, because the definition is product of no numbers at all is 1. i.e why 0! = 0 or 0! = Undefined or Infinite Instead of 0! = 1 Thanks & Regards, Prashant S Akerkar 
August 24th, 2011, 03:20 AM  #2  
Senior Member Joined: Feb 2010 Posts: 706 Thanks: 140  Re: Computing Factorial of a Number Quote:
When you are done with that, look up Gamma function.  
August 24th, 2011, 09:19 AM  #3  
Senior Member Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,211 Thanks: 520 Math Focus: Calculus/ODEs  Re: Computing Factorial of a Number Quote:
1! = 1*(11)! 1 = 0!  
August 24th, 2011, 06:10 PM  #4 
Banned Camp Joined: Aug 2011 Posts: 534 Thanks: 2  Re: Computing Factorial of a Number
Thank you. Also check these links below http://www.allexperts.com/user.cgi?m=6& ... ID=4914780 http://www.allexperts.com/user.cgi?m=6& ... ID=4881366 http://www.allexperts.com/user.cgi?m=6& ... ID=5019934 Thanks & Regards, Prashant S Akerkar 
August 24th, 2011, 06:31 PM  #5 
Banned Camp Joined: Aug 2011 Posts: 534 Thanks: 2  Re: Computing Factorial of a Number
Thank you. Can we also say similar to even number, odd number, Fibonacci, Reflective number (looking numbers in mirror  offering symmetry), Reflective character (looking characters  upper and lower case  offering symmetry viz A...Z and a ...z) a factorial number series ? i.e. 1,2,6,24,120,720 .... Thanks & Regards, Prashant S Akerkar 
August 24th, 2011, 06:37 PM  #6 
Banned Camp Joined: Aug 2011 Posts: 534 Thanks: 2  Re: Computing Factorial of a Number
Thank you. Did I miss the 0! in the Factorial series? So it will be 1,1,2,6,24,120,720 ... Thanks & Regards, Prashant S Akerkar 
August 25th, 2011, 12:04 AM  #7  
Global Moderator Joined: Dec 2006 Posts: 20,471 Thanks: 2039  Quote:
 
August 25th, 2011, 03:52 AM  #8 
Banned Camp Joined: Aug 2011 Posts: 534 Thanks: 2  Re: Computing Factorial of a Number
Thank you. I mean similar to even number, odd number, square, Fibonacci series, prime number we can have the factorial number series even number : 2, 4, 6, 8, 10 , 12 ..... odd number : 1, 3, 5, 7, 9, 11, 13 ..... square : 1, 4, 9, 16, 25, 36, 49 ..... Fibonacci : 0, 1, 1, 2, 3, 5, 8, 13, 21, 34 .... prime : 2,3,5,7,11,13,17,19 ..... factorial number : 1,1,2,6,24,120, 720 ..... Thanks & Regards, Prashant S Akerkar 
August 25th, 2011, 06:33 PM  #9 
Senior Member Joined: Jun 2011 Posts: 298 Thanks: 0  Re: Computing Factorial of a Number
There is not similarity between factorial function and Fibonacci number, but they have one thing in common; namely, they both are recursive.

November 15th, 2011, 10:55 PM  #10 
Banned Camp Joined: Aug 2011 Posts: 534 Thanks: 2  Re: Computing Factorial of a Number
Thank you. Attaching Image .... Thanks & Regards, Prashant S Akerkar 

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